Atomic Number

Question 1

Atomic Number (Z)

Answer 1

Number of protons in a nucleus of an atom.

Question 2

Elements are arranged according to

Answer 2

Increasing atomic number in the periodic table

Question 3

Atomic mass( A)

Answer 3

Tells us how many nucleons are in the nucleus of an atom.

Question 4

Nucleons

Answer 4

Protons and neutrons

Question 5

The nucleus has what charge

Answer 5

Positive charge due to the protons and the neutrons have a neutral charge so no electric charge.

Question 6

Nucleons are held together by

Answer 6

Strong nuclear forces over short distances. It overcome the electrostatic forces of repulsion that the positive protons exert on each other

Question 7

It takes enormous amount fi energy to split a nucleus apart to fuse the other particles to increase the nuclear size

Answer 7

It releases vast amounts of energy to split a nucleus of an atom.

Question 8

Chemical reactions cause change in the

Answer 8

Arrangement of electrons in an an atom and not the nucleus

Question 9

N

Answer 9

Number of neutrons

Question 10

Atomic Number (Z) is always given

Answer 10

At the top left hand side of an element.

Question 11

Relative atomic mass is given

Answer 11

Below the element’s symbol

Question 12

Isotope

Answer 12

An atom of the same element with the same number of protons and a different number of neutrons in its nucleus.

Question 13

Relative atomic mass

Answer 13

Average mass of all the different isotopes of an elemtn (taking into account the amount of each isotope) on a scale where carbon 12 atoms have a mass of exactly 12.

A measure of how much mass an atom has in relation to carbon 12.

Question 14

Calculating relative atomic mass

Answer 14

Total mass of all atoms(atomic mass x abundance)
Over
Total number of atoms (100)

Question 15

The symbol of relative atomic mass

Answer 15

Ar

Question 16

Unit for relative atomic mass

Answer 16

Not given unless they tell you to say to 3sf

Or a. m. u(@tomic mass unit)