Atomic number, mass number and isotopes

Question 1

describe atomic number

Answer 1

Atomic number is the number of protons and electrons

Question 2

describe mass number

Answer 2

• mass number is the number of neutrons which is workout by taking the mass number (at the top) and taking away the atomic number (at the bottom)
• The mass number is the total number of protons and neutrons

Question 3

What are isotopes?

Answer 3

• Isotopes are different form of the same elements
• They have the same number of protons (atomic numbers) but different number of neutrons (mass number)

Question 4

What is the Relative atomic mass of an Element

Answer 4

It is the average mass of one atom of the element compared to half the mass of an atom of carbon 12

Question 5

how is relative atomic mass and isotopes linked to each other ?

Answer 5

if an element has only one isotope than its Ar (relative atomic mass) will be the same as its mass number.

Question 6

What happens if an element has more than one isotope

Answer 6

if an element have more than one isotope than it takes into account how much of each isotope is more in order to workout the average e.g
chlorine 35 is more than chlorine 37
so chlorines Ar works out to be 35.5