3. atoms combining

Question 1

ion

Answer 1

is a charged particle (has unequal number of protons and electrons )

Question 2

positive ions

Answer 2

cations

Question 3

negative ions

Answer 3

anions

Question 4

ionic bond

Answer 4

is a strong electrostatic attraction between ions of the opposite charge

Question 5

ionic compound

Answer 5

forms when metal atoms lose electrons to non-metal atoms and it forms a lattice

Question 6

ions of first 20 elements

Answer 6

metals + hydrogen —> positive ions
non-metals —> negative ions
Groups IV and V —> usually doesn’t cause too much to gain or lose
Group V111 —> no ions

Question 7

single covalent bond

Answer 7

formed when two atoms share a pair of electrons leading to full outer shells

Question 8

molecule

Answer 8

two or more atoms held together by covalent bonds

Question 9

covalent compounds

Answer 9

atoms of different elements share electrons

Question 10

properties of ionic compounds

Answer 10

1. high melting and boiling points
2. usually soluble in water
3. conduct electricity when melted or dissolved in water

Question 11

properties of covalent compounds

Answer 11

1. low melting and boiling points
2. insoluble in water
3. do not conduct electricity

Question 12

giant covalent structures

Answer 12

diamond, silicon(IV) oxide, graphite

Question 13

metals

Answer 13

form a giant lattice structure with strong metallic bonds

Question 14

metallic bonds

Answer 14

are the electrostatic attraction between the positive metal ions and a ‘sea’ of delocalised electrons