Atomic structure L1

Question 1

What is the atomic number?

Answer 1

The number of protons

Question 2

What is the mass number, A?

Answer 2

The number of protons and neutrons combined

Question 3

What is the relative mass of an electron?

Answer 3

1/1840

Question 4

What can protons and neutrons be called?

Answer 4

nucleons

Question 5

How can you remember the difference between anions and cations?

Answer 5

CATs are PAWsitive

Anions- onions-cry-negative

Question 6

What is a cation?

Answer 6

A positive ion- an atom has lost electrons so there are more protons than electrons

Question 7

What is an anion?

Answer 7

A negative ion- an atom has gained electrons so that there are more electrons than protons

Question 8

Why do isotopes of the same element have the same chemical properties?

Answer 8

They have the same electron configuration- (same number and arrangement)

Question 9

What is electron configuration?

Answer 9

The arrangment of electrons in orbitals/energy shells

Question 10

Define isotope

Answer 10

Atoms of the same element with the same number of protons but different number of neutrons

Question 11

Points to remember after completing ques:

Answer 11

1. If the number of electrons change in an element its going to be an ion
2. The proton number/ atomic number NEVER changes
3. If the electrons change in an element or ion the atomic number still stays the same

Question 12

Explain why isotopes can have different physical properties

Answer 12

The isotopes have different masses (and physical properties depend on the mass of the element)