CHAPTER 1

Question 1

how many groups in the periodic table and what are the names of

1) 0
2) 7
3) 1

Answer 1

1) noble gases
2) halogens
3) alkaline metals

Question 2

what charge to atoms have?

Answer 2

no charge

Question 3

what do the number of protons equal?

neutrons or electrons?

Answer 3

electrons

Question 4

atomic number =

Answer 4

the number of protons

Question 5

mass number=

Answer 5

protons and electrons

Question 6

why are the noble gases unreactive?

Answer 6

they have a full outer shell

Question 7

what do isotopes mean?

Answer 7

different forms of the same elements, same number if protons but a different number of neutrons

Question 8

what does same number if protons but a different number of neutrons mean?

Answer 8

the same chemical properties because the have the same number of electrons but they have he different physical properties

Question 9

what is filtration used to do?

Answer 9

separate a insoluble solid from a liquid

Question 10

what is crystallisation used to do?

Answer 10

used to separate a soluble solid from a liquid

Question 11

what is simple distillation used to do?

Answer 11

separate a liquid from a solid if we want to keep the liquid