Chemistry

Question 1

What is the atomic number of an atom?

Answer 1

The number of protons an atom has

Question 2

What is the atomic mass or mass number of an atom?

Answer 2

The number of protons and neutrons an atom has

Question 3

What is an ion?

Answer 3

An atom ore molecule that has gained or lost one or more of their valence electrons and therefore have a net positive or negative charge

Question 4

What is an atom?

Answer 4

An incredibly small particle made of mostly empty space

Question 5

What is an element?

Answer 5

A unique, pure chemical substance made of atoms of only one type

Question 6

What is an isotope?

Answer 6

An atom with the same number of protons, but different numbers of neutrons

Question 7

What does a compound contain?

Answer 7

Atoms of different elements chemically bonded together

Question 8

What is a mixture made of?

Answer 8

Two or more substances that are not chemically combined

Question 9

What does the Law of Conservation of mass state?

Answer 9

During chemical reactions, matter is neither created or destroyed

Question 10

What is the main rule during all chemical reactions?

Answer 10

The total mass of products is always equal to the total mass of reactants

Question 11

What are molecules?

Answer 11

Small groups of atoms chemically bonded together

Question 12

What are the signs of a chemical reaction occurring?

Answer 12

Change in colour, change in temperature, formation of a precipitate, emission of light or production of gas

Question 13

What are the columns of the periodic table known as?

Answer 13

Groups

Question 14

What are the rows of the periodic table known as?

Answer 14

Periods

Question 15

What do all elements in the same group contain?

Answer 15

Similar chemical properties and the same number of outer shell electrons

Question 16

What do the left-hand and right-hand sides of the periodic table contain?

Answer 16

The left-hand side contains metals, whilst the right-hand side contains non-metals

Question 17

What does the group number of the periodic table indicate?

Answer 17

The number of valence electrons an element has

Question 18

What does the period number of the periodic table indicate?

Answer 18

The number of shells and element has

Question 19

What is the electronic configuration?

Answer 19

The arrangement of electrons around the nucleus

Question 20

What are outer shell electrons known as?

Answer 20

Valence electrons

Question 21

How many electrons can the first electron shell, closest to the nucleus hold?

Answer 21

2 electrons

Question 22

How many electrons can the second and third electron shells?

Answer 22

8 electrons each

Question 23

What elements are found in group 1?

Answer 23

Alkali metals

Question 24

What elements are found in group 2?

Answer 24

Alkaline earth metals

Question 25

What elements are found in group 7?

Answer 25

Halogens

Question 26

What elements are found in group 8?

Answer 26

Noble gases, which contain a complete outer shell of electrons

Question 27

How many naturally occurring elements are there?

Answer 27

92 elements

Question 28

How many artificially produced elements are there?

Answer 28

17 elements

Question 29

How are elements in the periodic table arranged?

Answer 29

In order of increasing atomic mass