a substance made up of atoms with the same atomic number ( proton number )
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What is a compound?
a substance made up of two or more elements bonded together
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What is a Mixture?
A combination of different substances not bonded to one another
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What is the relative mass of a proton
proton= 1
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What is the relative mass of a neutron?
neutron= 1
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what is the relative mass of an electron?
electron= 1/1836
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What is the relative charge of a proton?
proton= +1 heavy and posotive
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What is the relative charge of a neutron?
neutron= 0 heavy and neutral
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What is the relative charge of a electron?
electron= -1 have hardly any mass and are negatively charged
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What is the Mass Number?
The number of protons and neutrons
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What is the Atomic Number?
The number of protons
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Describe a nucleus
1) in the middle of the atom 2) contains protons and neutrons 3) has a positive charge because of the protons 4) the whole mass of an atom contained in nucleus 5) it is tiny
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Describe an electron
1) electrons move around the nucleus in energy levels called shells 2) negatively charged 3) are tiny but their orbitals cover a large space 4) small mass
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What is the number of protons equal to?
Number of protons = number of electrons
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What is an ion?
When some electrons are added or removed from an atom becomes charged and then it is an ion
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Explain what is meant by the term isotope
Isotope means atoms of the same element which have different number of protons but the same number of protons.
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Explain what is meant by Relative Atomic Mass
Relative atomic mass is the weighted average mass of the isotopes of an element measured on a scale on which a carbon 12 atom has a mass of exactly 12 units
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How are electrons arranged?
Electrons are arranged in energy levels ( or shells ) around the nucleus
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Where is a low energy electron located?
Close to the nucleus
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Where is a high energy electron located?
Far away from the nucleus
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How many electrons in each energy level?
1) 2 2) 8 3) 8 4) 18
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What is the group on the periodic table ?
The group goes down and is the number of electrons in the outer energy level
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What is the period in the periodic table?
The period goes across and is the number of energy levels
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Why do elements in any one group have similar chemical properties?
Because they have the same number of electrons in their outer shell.
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Why are noble gases un-reactive?
They are un-reactive because they have a full energy level of electrons
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