1.1 - Atomic Structure

Question 1

What is the charge of neutrons, electrons and protons?

Answer 1

Protons= +1
Neutrons= 0
Electrons= -1

Question 2

What does the atomic mass define?

Answer 2

The number of protons and total mass of the atom

Question 3

What does the atomic number define?

Answer 3

The number of protons in an atom.

Question 4

What is the radius of a atom and it’s nucleus?

Answer 4

Atom radius= 0.1nm

Nucleus radius= less than 1/10000nm

Question 5

What is a compound?

Answer 5

A compound is two or more elements chemically bonded together.

Question 6

How do you calculate the relative atomic mass from the mass and abundance of its isotope?

Answer 6

Relative atomic mass=(35x75)+(37x25)/(75+25)=3550/100=35.5

Question 7

What is an isotope?

Answer 7

Isotopes are atoms of an element with the same atomic number but a different mass number, indicating a different number of neutrons.

Question 8

What is the structure of an atom?

Answer 8

The structure of an atom as a central positively charged nucleus containing protons and neutrons (most of the mass) surrounded by orbiting electrons in shells.

Question 9

Demonstrate knowledge and understanding of how ideas about the atom changed over time.

Answer 9

The Plum Pudding model
Rutherford’s model of a nucleus surrounded by electrons
The discovery of the neutron by Chadwick, leading to today’s model of the atom