Atoms

Question 1

What is an atom?

Answer 1

An atom is the smallest part of an element that can exist by itself

Question 2

What is found in the nucleus?

Answer 2

Protons and Electrons

Question 3

What orbits around the nucleus?

Answer 3

Electrons

Question 4

What is the charge of a proton, electron and neutron?

Answer 4

Proton = +1
Neutron = 0
Electron = -1

Question 5

What is the mass of a proton, electron and neutron?

Answer 5

Proton = 1
Electron = 0
Neutron = 1

Question 6

What does the atomic number tell you?

Answer 6

The number of protons and electrons

Question 7

What does the mass number tell you?

Answer 7

The sum of protons and electrons

Question 8

How many protons electrons and neutrons in sodium?

Answer 8

Protons = 11
Electrons = 11
Neutrons = 12

Question 9

What is an isotope?

Answer 9

An element with the same number of protons and electrons but a different number of neutrons

Question 10

What is the definition of the relative atomic mass, Ar?

Answer 10

The average mass of atoms of an element taking into account the mass and amount of each isotope it contains, on a scale where the mass of a 12C is 12

Question 11

What idea did John Dalton have about atoms?

Answer 11

Everything is made up of particles called atoms. Atoms cannot be divided

Question 12

How did J.J. Thompson discover electrons?

Answer 12

Conduction of electricity through gases

Question 13

Using gold leaf and alpha particles, Rutherford, Geiger and Marsden discovered what?

Answer 13

Positive nucleus in the centre of the atom

Question 14

What did Chadwick discover?

Answer 14

Neutrons

Question 15

What is the electron arrangement and short hand for sodium?

Answer 15

2,8,1

Question 16

How many electrons are in the first shell before its full?

Answer 16

2

Question 17

Why is an atom neutral?

Answer 17

Positive protons and negative electrons cancel each other out