Unit B - Section 2

Question 1

Atoms

Answer 1

Each element is composed of a particle called an atom

Question 2

Dalton’s theory

Answer 2

Suggested that matter was made up of elements

Question 3

Electrons

Answer 3

Negatively charged particles

Question 4

Nucleus

Answer 4

A tiny positively charged centre

Question 5

Protons

Answer 5

Positively charged particles

Question 6

Neutrons

Answer 6

Neither positively or negatively charged

Question 7

Bohr’s theory

Answer 7

Believed that electrons jump between these shells by gaining or losing energy. Bohr also stated that electrons moved in specific circular orbits

Question 8

Atomic mass

Answer 8

Is the mass of one atom of an element

Question 9

Each horizontal row is called a

Answer 9

Period (1-7)

Question 10

Each vertical column forms a

Answer 10

Group or a family of elements (1-18)

Question 11

Atomic number

Answer 11

Shows how many protons there r in the element

Question 12

Metals

Answer 12

Green box represents metals (metals r shiny malleable and ductile) they also conduct electricity

Question 13

Metalloids

Answer 13

Purple box represents metalloids (metalloids have both metallic and non metallic properties)

Question 14

Non metals

Answer 14

The orange box represents non metals (can be a solid or a gas. Non metals r dull brittle elements. Do not conduct electricity)

Question 15

Alkali metals

Answer 15

The most reactive of all the metals (they r group one elements) they react when composed to air or water

Question 16

Alkaline earth metals

Answer 16

React when composed to air and water. The reactivity isn’t as strong as alkali metals group 2 in the periodic table

Question 17

Halogens

Answer 17

Halogens is group 17. They r the most reactive non metals

Question 18

Noble gases

Answer 18

Noble gases is group 18. They r the nose stable and unreactive elements

Question 19

Atomic mass unit

Answer 19

Atomic mass us measured by atomic mass unit (amu).

Question 20

Mass number represents…

Answer 20

The number of protons and neutrons in an atom

Question 21

Groups 3-12 r called…

Answer 21

Transitional metals