Ch-5: Atomic structure

Question 1

All matter is made up of _ _ _ _ _

Answer 1

Atoms

Question 2

What are atoms made up of?

Answer 2

sub atomic particles such as protons neutrons and electrons

Question 3

True/False:

Atoms of different element have same atomic number

Answer 3

False, Atoms of different element have different atomic number

Question 4

Define:

Atomic Number

Answer 4

Atomic number refers to the number of protons or electrons in an atom

Question 5

Are atoms are electrically neutral? If so, why?

Answer 5

Yes, they are electrically neutral because they have an equal number of electrons and protons in an atom. The positive charges of the proton gets cancelled out by the negative charges of the electron

Question 6

Define:

Nucleon number(Mass number)

Answer 6

Nucleon number or mass number is the total number of proton and neutron in an atom. It is also known as the mass number because the number of protons and neutrons give the total mass of the number

Question 7

Define:

Isotopes

Answer 7

Isotopes are atoms of the same element with the same number of protons and electron but different number of neutron

Question 8

True/False:

Isotopes have different chemical properties and different physical properties

Answer 8

False, Isotopes have similar chemical properties but different physical properties

Question 9

True/False:

Isotopes have same nucleon number(mass number)

Answer 9

False, Isotopes have different nucleon number(mass number)