Structure of Atoms

Question 1

Atomic Theory

Answer 1

All matters is made of atoms (this includes chemicals)

Question 2

Elements

Answer 2

A substance made up of atoms with the same atomic number

Question 3

Compounds

Answer 3

Contains two or more atoms of different elements in fixed ratio

Question 4

Atom

Answer 4

The basic building block of matter. It is made up of subatomic particles.

Question 5

Molecule

Answer 5

Contains two or more atoms bonded together

Question 6

Subatomic Particles

Answer 6

Made up of neutrons, protons and electrons.

Question 7

Neutron

Answer 7

• Neutral charge (0)

- Weight 1 atomic mass unit (amu)

Question 8

Proton

Answer 8

• Positive charge (+1)

- Weight 1 amu

Question 9

Electron

Answer 9

• Negative charge (-1)

- Weight 1/1800 amu

Question 10

Atomic structure

Answer 10

Electrons and protons are held together by electrostatic attraction (opposite charges)

Question 11

Mass number

Answer 11

Number of protons and neutrons

Question 12

Atomic number

Answer 12

Number of protons

Question 13

Chemical symbols for the element

Answer 13

Made up of one or two letters where the first letter capitalised and the second letter is lowercase

Question 14

Isotopes

Answer 14

Atoms that have the same number of protons but different number of neutrons

Question 15

Carbon

Answer 15

Common element that has three naturally occurring isotopes

Question 16

The Bohr Model

Answer 16

• Electrons move in fixed circular orbits
• Orbits correspond to energy levels in the atom
• Electrons can only occupy these orbits, not between them
• Larger (outer) orbits correspond to higher energy levels
• Move between shells by absorbing or emitting light
• Prefers the lowest energy state so fill the inner shell first.