The Atom

Question 1

Describe the atom

Answer 1

An atom consists of a central positive nucleus containing positive protons and neutral neutrons , surrounded by negative electrons

Question 2

What is the mass and charge of a proton ?

Answer 2

Mass = 1

Charge = +1

Question 3

What is the mass and charge of an electron?

Answer 3

Mass = 0

Charge = -1

Question 4

What is the mass and charge of a neutron ?

Answer 4

Mass = 1

Charge = 0 ( neutral )

Question 5

What is the overall charge of an atom and why ?

Answer 5

The over all charge is neutral because the number of positive protons (+1) and negative electrons (-1) are equal and the charges cancel each other out .

Question 6

What is the mass number ?

Answer 6

Top number

Total number of protons plus neutrons in an atom

Question 7

What is the atomic number ?

Answer 7

Number of protons in an atom (also equals number of electrons)

Question 8

If we want to find the number of protons use …

Answer 8

… bottom number

Question 9

If we want to find number of electrons use …

Answer 9

Bottom number

Question 10

How do you find the neutrons in a atom ?

Answer 10

Top - bottom number

mass number - atomic number