2.2/2.3 Elements, groups and organizing

Question 1

Atomic mass

Answer 1

the weight of a single atom

measured in atomic mass units AMU

Question 2

each atom is made up of

Answer 2

proteins, neutrons, electrons

Question 3

In each box on the periodic table elements are arranged horizontally by —–

Answer 3

atomic number

Question 4

Atomic Number

Answer 4

is the number of proteins (and electrons) in the atoms nucleus

Question 5

Atomic number facts

Answer 5

the number of protiens in an atom is like the fingerprint of the atom, if you change the number of protons you change the element.

Question 6

Alkaline Metals (group one)

Answer 6

1. Most reactive of the metals 2. React when exposed to air or water 3. As you move down the group reactivity increases

Question 7

Alkaline Earth Metals

Answer 7

They react when exposed to water or air but not as strong as the Alkaline metals

Question 8

Halogens (17)

Answer 8

1. various colours and physical states 2. Most reactive of the non metals 3. Can combine with other metals to form new substances

Question 9

Noble gases (18)

Answer 9

1. Most stable and unreactive elements 2. Long thought that they could not combine with other elements.