Group 7 - the halogens

Question 1

What is another name for the elements in group 7?

Answer 1

The halogens

Question 2

Are group 7 elements metals or non metals?

Answer 2

non metals.

Question 3

How many electrons do group 7 elements have in their outer shell?

Answer 3

7.

Question 4

What is a covalent bond?

Answer 4

When two non-metal atoms share a pair of electrons.

Question 5

What happen as we move down group 7?

Answer 5

• melting and boiling point increase
• relative molecular mass increases

Question 6

What is a compound in chemistry?

Answer 6

Substances formed by two or more elements. They are held together by chemical bonds.

Question 7

How do atoms make bonds?

Answer 7

giving away, taking or sharing electrons.

Question 8

How do you separate original elements of a compound?

Answer 8

a chemical reaction

Question 9

What is ionic bonding?

Answer 9

• a compound of a metal and a non metal
• the metal looses electrons to form positive ions
• non metals gain electrons to form negative ions.
• The opposite charges mean they are strongly attracted to each other.

Question 10

What are some examples of compounds which are bonded ionically?

Answer 10

• sodium chloride
• magnesium oxide
• calcium oxide

Question 11

examples of compounds that are bonded covalently?

Answer 11

• hydrogen chloride gas
• carbon monoxide
• water

Question 12

What happens when the group 7 elements become less reactive?

Answer 12

the outer shell is further from the nucleus so its harder to gain an extra electron

Question 13

what do halogens form when they bond with metals?

Answer 13

-1 ions called halides

Question 14

What happens between a more reactive halogen and less reactive halogen?

Answer 14

a displacement reaction will happen between the more reactive halogen and the salt of a less reactive one.