Atomic Structure

Question 1

What is the relative electrical charge of : ?

A proton
A neutron
A electron

Answer 1

Proton = +1
Neutron = 0
Electron = -1

Question 2

Why do atoms have no overall charge ?

Answer 2

The number of protons (+1 charge) and electrons (-1 charge) are equal.

Question 3

What does the atomic number of an element represent ?

Answer 3

The amount of protons and electrons.

Question 4

Where are protons, electrons and neutrons located in the atom ?

Answer 4

The nucleus

Question 5

What fraction of the atoms radius is the nucleus ?

Answer 5

1/10,000

Question 6

What is the approximate radius of an atom ?

Answer 6

0.1nm

Question 7

What is the relative mass of: ?

Proton
Neutron
Electron

Answer 7

Proton = 1
Neutron = 1
Electron = 0 very small

Question 8

What does the mass number of an element represent ?

Answer 8

Sum of protons + neutrons in an atom of that element.

Question 9

What is an isotope ?

Answer 9

Same amount of protons and different amount of neutrons

Question 10

Hoe many, protons, neutrons and electron in an atom of sodium ?

Answer 10

Protons =11
Neutrons =12
Electrons =11

Question 11

How is the relative mass (Ar) calculated ?

Answer 11

The average atomic mass of an element taking account the abundance of the isotopes of the element.

Question 12

What element has the electron configuration 2,8,6 ?

Answer 12

Sulfur

Question 13

What is the electron configuration of potassium ?

Answer 13

2,8,8,1