Atoms, compounds and isotopes

Question 0

What is the mass of each: proton, neutron and electron?

Answer 0

Proton = 1
Neutron = 1
Electron = 0 (very small)

Question 1

What is the mass number of an element made up of?

Answer 1

Protons and neutrons

Question 2

What part of the atom does the atomic number show?

Answer 2

Protons

Question 3

Sodium, Na, has an atomic number of 11 and a mass number of 23. How many electrons and neutrons does sodium have?

Answer 3

Electrons = 11
Neutrons = 12

Question 4

Why are electrons not counted in the mass number of an element?

Answer 4

Because their mass is very small

Question 5

A chemical reaction between carbon and oxygen forms which compound?

Answer 5

Carbon dioxide

Question 6

What is a compound?

Answer 6

A compound is a substance formed when two or more atoms are chemically combined together

Question 7

Isotopes are different atomic forms of the same element which have a different number of…?

Answer 7

Neutrons. They have the same number of protons

Question 8

As the isotope changes, what part of the element changes. The Mass or atomic number?

Answer 8

Mass number. The atomic number stays the same as if this was to change it would completely change the element itself

Question 9

Carbon-12 and carbon-14 are examples of what?

Answer 9

Isotopes