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- Created by: leah.mc
- Created on: 04-06-21 19:24
how has the plum pudding model developed?
we thought that atoms were electrons spreading through a ball of positive charge.so they shot positive particles were fired at a sheet of atoms, they should have passed straight throught, but some deflected meabing there was a concentration of mass and po
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which two is in the nucleus?
.protons
.neutrons
.electrons
.protons
.neutrons
.electrons
protons&neutrons
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what is the mass and charge of a proton?
charge= +1
mass= 1
mass= 1
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what is the mass and charge of electrons?
charge= -1
mass= nearly zero
mass= nearly zero
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what is the mass and charge of neutrons?
charge= none
mass= 1
mass= 1
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where is a proton found?
nucleus
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where is a electron found?
orbiting the nucleus in shells
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where is a neutron found?
nucleus
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what is the size of an atom?
10^-8
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what is an isotope?
atoms of the same element and has the same number of protons
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what is different version isotopes?
atoms of the same element and has the same number of protons but has different number of neutrons
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how do you work out the weight of a compound?
add atomic numbers of the elements inside the compound
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what is a covalent bond made up from?
non metals and non metals
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when non-metals react with metals and gain elections they make .....ions
negative
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properties of non metals
.dull-looking
.brittle
.not always solid at room temp
.generally don't conduct energy
.less dense than metals
.brittle
.not always solid at room temp
.generally don't conduct energy
.less dense than metals
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what will atoms with incomplete shells do?
lose,gain or share electrons
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how are elements ordered?
increasing atomic number
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what are columns called
groups
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how are groups sorted?
elements with similar properties
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what does group numbers tell you?
how many electrons there is there outer shell
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how does metals form positive ions?
loosing electrons
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where are metals found in the periodic table?
left and middle
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what do metals contain causing them to have similar basic physical properties?
metallic bonds
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what is group 1 elements called?
alkali metals
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group 1 elements have 1 electron in their outer energy level making them...
very reactive
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what do group 1 to form ions with a +1 charge?
lose the outh=er most electron
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what are the 6 group 1 elemets?
-lithium
-sodium
-potassium
-rubidium
-caesium
-francium
-sodium
-potassium
-rubidium
-caesium
-francium
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what are reactions with group 1 metals like?
vigorous
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when group 1 metals react with water they produce...
hydrogen gas and metal hydroxides
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when going down group 1 what do the reactions go like?
explosive
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when group 1 metals react with chlorine gas what do they produce?
white metal chlorine salts
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when group 1 metals react with oxygen the reaction happens quickly and create...
metal oxide
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does group 1 metals have a higher or lower relative atomic mass?
higher
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does group 1 metals have a higher or lower melting and boiling point?
lower
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what are group 7 elements called?
the halogens
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what do group 7 non-metals with coloured vapours exist as?
diatomic molecules
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what ere the 5 group 7 elements?
.Florine
.chlorine
.bromine
.iodine
.astatine
.chlorine
.bromine
.iodine
.astatine
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Florine is very reactive and create a...
poisonous yellow gas
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chlorine is fairly reactive and create a...
poisonous green gas
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bromine is dense and create a...
poisonous red-brown volatile liquid
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what do all halogens have in their outer shell?
7 electrons
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what will more reactive halogens to less reactive ones from a compound?
displace
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halogens can form covalently bonded compounds by..
sharing electrons with non-metals
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halogens reacting with non-metals form...
simple covalent compounds
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when halogens react with metals they from a ion with a ... charge
-1
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in the halogens the elements become ... reactive as you go down the group
less
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does the halogens have a higher or lower relative atomic mass?
higher
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does the halogens have a higher or lower melting and boiling points?
higher
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what are the group 0 elements called?
the noble gasses
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all elements in group 0 has ... electrons in their outer shell except helium?
8
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helium has .... electrons in their outer shell?
2
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why is the noble gases and inert?
they do not donate or receive electrons
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a noble gas is a monatomic gas. what is this?
single atoms not bonded to each outher
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when are noble gases a colourless gas?
room temperature
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as you go down the noble gas group the bioling points......
increase
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what did wolfgang dobereiner make?
traids(grouping similar elements in sets of three)
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in 1865 by jhon newlands put the elements in order of relative atomic mass....
he found every eighth element was similar and his patter was known as Newland law of octaves. Unfortunately his pattern only worked for the first fifteen elements or so
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in 1869 the problem was solved by a Russian names dimtri Mendeleev and he also tried putting the elements in order of atomic mass.
he left gaps in his table which were claimed were for elements that had not yet been discovered. he was doubted by other scientists bit he predicted properties of elements that would fill the gaps
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Other cards in this set
Card 2
Front
which two is in the nucleus?
.protons
.neutrons
.electrons
.protons
.neutrons
.electrons
Back
protons&neutrons
Card 3
Front
what is the mass and charge of a proton?
Back
Card 4
Front
what is the mass and charge of electrons?
Back
Card 5
Front
what is the mass and charge of neutrons?
Back
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