additional chemistry 0.0 / 5 ? ChemistryallGCSEEdexcel Created by: Niky2346Created on: 19-02-16 17:32 periods are horizontal 1 of 25 groups are vertical 2 of 25 metals are found on what side? the left-hand side in the centre 3 of 25 non-metals are found on what side? the right-hand side 4 of 25 how are the elements in the periodic table arranged? in order of their atomic numbers 5 of 25 give the symbol for non-metal in perioid 3 of the periodic table. Si P S Cl Ar 6 of 25 what is the atomic number? number of protons in nucleus 7 of 25 what is the mass number? total of protons and neutrons in nucleus 8 of 25 what are isotopes atoms of same element with different number of neutrons 9 of 25 why does an ion have a charge? it has lost electrons or gained electrons 10 of 25 ions consist of.. a non-metal and metal 11 of 25 cations are are positively charged metals from the outcomes of ionic bonding 12 of 25 anions are are negitively charged non-metals from the outcomes of ionic bonding 13 of 25 the metal ions in salt of sodium produce a yellow flame 14 of 25 the metal ions in salt of potassium produce a lilac flame 15 of 25 the metal ions in salt or calcium produce a red flame 16 of 25 the metal ions in salt of copper produce a green-blue flame 17 of 25 covalent bonding happens between non-metals 18 of 25 what happens in a covalent bonding a covalent bond is a pair of elctrons that is shared between two atoms 19 of 25 simple molecular covalent substances have weak forces between the molecules: low melting points and low bioling points 20 of 25 giant molecular convalent sunbstances are strong. takes a lot of energy to break bond... melting and billing points are high 21 of 25 alkali metals are in + properties group 1 + soft metals, low melting points 22 of 25 halogens are in + properties group 7 + all react with metals to form compounds called halides. reactivity decreases as you go down. 23 of 25 noble gases are in group 0, they have a full outer shell. they are INERT 24 of 25 noble gases uses: welding ( argon or helium) inside filament light bulbs ( xenon or argon) fire- extinguishing systems ( argon) 25 of 25
Comments
No comments have yet been made