GCSE chemistry recap

Question 1

what is the top number on an element?

Answer 1

the atomic mass/number
total number of protons and neutrons

Question 2

What is the bottom number on an element?

Answer 2

the atomic number
number of protons and electrons

Question 3

How do you figure out the group?

Answer 3

the number of electrons in the outer shell

Question 4

How do you figure out the period?

Answer 4

the number of shells

Question 5

Define isotope

Answer 5

Atoms of the same element with the same atomic number but different mass numbers due to different numbers or neutrons

Question 6

what is an element?

Answer 6

made up of one type of atom

Question 7

what is a compound?

Answer 7

made up of two or more different types of elements chemically combined

Question 8

what is the difference between a compound and a mixture?

Answer 8

mixtures are not chemically combined

Question 9

what is the definition of an ion?

Answer 9

a charged particle

Question 10

when are positive ions formed?

Answer 10

when metals lose electrons (cations)

Question 11

when are negative ions formed?

Answer 11

when non-metals gain electrons (anions)