Day 20 (chemistry)

Question 1

Which sub-atomic particles are found in the nucleus of an atom?

Answer 1

Protons and neutrons

Question 2

What does the atomic number tell you about the atoms of an element?

Answer 2

The number of protons

Question 3

What does the mass number tell you about the atoms of an element?

Answer 3

The number of protons plus neutrons

Question 4

Why do atoms have no overall charge?

Answer 4

They have equal numbers of protons and electrons

Question 5

Define the term “isotopes”

Answer 5

Atoms with the same number of protons but different numbers of neutrons

Question 6

Define the term “relative atomic mass”

Answer 6

The weighted average of the mass numbers of the different isotopes of an element

Question 7

A sample of neon gas consists of 90% Neon-20 and 20% Neon-22. Calculate the relative atomic mass of neon.

Answer 7

20.2

Question 8

Give the maximum number electrons that can occupy the first energy level (shell) in an atom

Answer 8

2

Question 9

Give the maximum number electrons that can occupy the second energy level (shell) in an atom

Answer 9

8

Question 10

Give the maximum number electrons that can occupy the third energy level (shell) in an atom

Answer 10

8

Question 11

Write the electron configuration of an atom with 15 electrons

Answer 11

2,8,5

Question 12

How many shells are occupied in the atom with 19 electrons (2,8,8,1)

Answer 12

4

Question 13

What is a group in the periodic table?

Answer 13

A vertical column

Question 14

What is a period in the periodic table?

Answer 14

A horizontal row

Question 15

Give the group number of the atom with electron configuration 2,8,7

Answer 15

7

Question 16

Give the period number of the atom with electron configuration 2,8,7

Answer 16

3