Chemistry

Question 1

What is the Atomic number?

Answer 1

The number of protons in an atom.

Question 2

What is an isotope?

Answer 2

An isotope is an atom with the same number of protons but different number of neutrons (NOTE: isotope translates to ‘same’ and ‘place’).

Question 3

What is the equation for relative mass (AR)?

Answer 3

Ar=(mass x abundance) + (mass x abundance) / total abundance

Question 4

What does the group number show?

Answer 4

It shows the number of electrons in the outer shell.

Question 5

What do the period shells show?

Answer 5

The period numbers show how many electron shells there are.

Question 6

Who created the plum pudding model?

Answer 6

JJ Thompson (he worked out: atoms are spheres of positive charge and electrons have negative charge).

Question 7

Who created the nuclear model?

Answer 7

E. Rutherford (he worked out: atoms are made up of mostly empty space, positive charge was in the centre of the atom called nucleus, surrounded by negative electrons in orbit).