ATOM AND PERIODIC TABLE

Question 1

Give the word for the percentage of atoms in a sample that are a particular isotope

Answer 1

Abundance

Question 2

State the 3 relative charges of the 3 subatomic particles

Answer 2

Electron : -1
Proton : +1
Neutron : 0

Question 3

State the relative masses of the3 subatomic particles

Answer 3

Electron : very small
Proton : 1
Neutron : 1

Question 4

State the information provided by the mass number of an atom

Answer 4

Protons + neutrons

Question 5

State the information provided by the atomic number of an atom

Answer 5

The number of protons

Question 6

Explain why Mendeleev left gaps in his Periodic table

Answer 6

Undiscovered elements

Question 7

Electronic configuration of potassium

Answer 7

2,8,8,1

Question 8

Explain why Mendeleev’s Periodic Table was eventually accepted by other scientists

Answer 8

Elements were discovered which filled the gaps and matched the properties he predicted

Question 9

Describe the difference between mass number and relative atomic mass

Answer 9

Mass number is the number of protons and neutrons in one atom.
Relative atomic mass is an average value that takes account of isotopes.

Question 10

Before Mendeleev , describe how scientists ordered the elements

Answer 10

By their atomic weights

Question 11

Describe the information about electronic structure provided by an elements period in the periodic table

Answer 11

How many shells an atom has

Question 12

Describe the information about electronic structure provided by an element’s group in the Periodic Table.

Answer 12

How many electrons an atom has in the outer shell.

Question 13

Isotopes

Answer 13

Atoms of the same element with different numbers of neutrons.