The Nucleus

Question 1

What is the approximate radius for the atom

Answer 1

1 x 10(-10) m

Question 2

What are the 3 subatomic particles in an atom

Answer 2

Proton
Neutron
Electron

Question 3

Where is most of the mass of an atom concentrated?

Answer 3

In the Nucleus

Question 4

Describe the arrangement of protons, neutrons and electrons in an atom.

Answer 4

Protons and neutrons are found in the atom’s nucleus

Electrons are found in the shells orbiting around the nucleus

Question 5

What type of charge does the nucleus of an atom have and why ?

Answer 5

Positive because the proton has a positive charge and the neutrons have no charge. These opposite charges cancel each other out.

Question 6

Explain how an atom’s electron arrangement changes when it absorbs EM radiation.

Answer 6

Electrons move to lower energy levels

They move towards from the nucleus

Question 7

Explain how an atom’s electron arrangement changes when it emits EM radiation.

Answer 7

Electrons move to a lower energy level

They move towards the nucleus

Question 8

What is an isotope

Answer 8

An atom of an element that has a different number of neutrons, but the same number of protons.

Question 9

Define the mass number

Answer 9

The total number of protons and neutrons in the atom.

Question 10

Define the atomic number

Answer 10

The amount of protons and electrons in an atom

Question 11

How do atoms turn into positive ions?

Answer 11

They lose one or more of their outer electrons

Electrons are negatively charged, so the resultant charge of the atom is positive

Question 12

What are the relative masses of a proton, neutron and electron?

Answer 12

1-proton
1-neutron
1/1836-electron

Question 13

what are the relative charges of each atom

Answer 13

proton= +1
neutron= 0
electron= -1