Atoms And Electrons

Question 1

What is the atomic number

Answer 1

The number of protons

Question 2

What is the mass number

Answer 2

The number of protons and neutrons

Question 3

Describe a neutron

Answer 3

• found in the nucleus
• charge = 0
• mass = 1

Question 4

Describe a proton

Answer 4

• found in the nucleus
• charge = positive +1
• mass = 1

Question 5

Describe an electron

Answer 5

• found in the shells
• charge = negative -1
• mass = 0

Question 6

In a neutral atom the number of electrons is…

Answer 6

Equal to the number of protons

Question 7

To work out the number of neutrons we…

Answer 7

Subtract the atomic number from the mass number

Question 8

The number of protons is given by…

Answer 8

The atomic number

Question 9

What are isotopes

Answer 9

Atoms of the same elements which have the same number of protons but a different number of neutrons.

Question 10

What is the relative atomic mass

Answer 10

• atomic mass is the weighted average mass of an atom of an element based on the relative natural abundance of that elements isotopes. This is the number which is shown on the periodic table.

Question 11

How do you find which of the isotopes is more abundant?

Answer 11

(35)Cl vs (37)Cl
If the relative atomic mass is 35.5
35 is the mor abundant isotope.

Question 12

How do you calculate relative atomic mass

Answer 12

%1 x mass number (of %1) + %2 x mass number (of %2)
ALL DIVIDED BY
100

Question 13

DIAGRAM* practice drawing electron arrangements