Def For Atom Booklet

Question 1

Atomic number

Answer 1

Number of protons in an atom of an element

Question 2

Atomic mass

Answer 2

Number of protons & neutrons in the nucleus of an element

Question 3

Atom

Answer 3

Smaller particle of an element that retains the composition of that element

Question 4

Element

Answer 4

Substance that can’t be broken down into simpler substances by ordinary chemical means. Substancesnof which all the atoms have the same atomic number

Question 5

Compound

Answer 5

A substance that is formed when two or more
different elements combine together chemically in
a fixed ratio

Question 6

Mixture

Answer 6

A physical combination of different substances
(elements or compounds). The particles of a
mixture are not the same

Question 7

Diatomic molecule

Answer 7

A diatomic molecule consists of two of the same
elements chemically combined

Question 8

Elemental molecule

Answer 8

A substance consisting of only one type of
element (non-metal) chemically joined together

Question 9

Chemical change

Answer 9

A change and rearrangement in the composition
of reacting substances, resulting in a completely
NEW product being formed

Question 10

Physical change

Answer 10

A change only in the appearance, phase or smell
of a substance - without a change in its chemical
composition - resulting in no new product being
formed

Question 11

Combustion

Answer 11

The reaction of a metal or non-metal with oxygen.
It is a synthesis reaction