Unit 1: Atomic Theory

Question 1

The atomic number tells?

Answer 1

How many protons an atom of that element contains

Question 2

Sodium has an atomic number of 11. How many protons and electrons does sodium have?

Answer 2

11 protons
11 electrons

Question 3

Sodium has an atomic number of 11. What is sodium’s electron arrangement?

Answer 3

2,8,1

Question 4

Hydrogen has an atomic number of ?

Answer 4

1

Question 5

What is the mass number of an element equal to?

Answer 5

The number of protons plus the number of neutrons

Question 6

What are atoms with the same atomic number but different mass number called?

Answer 6

Isotopes

Question 7

What is the mass of electrons

Answer 7

They have a mass of zero therefore do not affect the mass of an element.

Question 8

Atoms are neutral because?

Answer 8

They have an equal number of positive protons and negative electrons

Question 9

Do metal atoms lose or gain electrons to form positive ions?

Answer 9

They lose electrons to form positive ions

Question 10

Do non-metals lose or gain electrons to form negative ions?

Answer 10

Non metals gain electrons to form negative ions