Question 1

Isotopes of an element have the same number of __________.

Accepted Answer

protons

Answer

neutrons

Answer

valence electrons

Answer

electrons

Question 2

What is the average atomic mass?

Accepted Answer

The weighted average of the masses of all naturally occurring isotopes of an element

Answer

The number of neutrons in an atom of an element

Answer

The number of protons in an atom of an element

Answer

The mass of an atom of an element

Question 3

What is the unit used to measure average atomic mass?

Accepted Answer

Atomic mass unit (AMU)

Answer

Pound (lb)

Answer

Meter (m)

Answer

Kilogram (kg)

Question 4

Thomson's model was called _______

Accepted Answer

Plum pudding model

Answer

Cathode ray model

Answer

Gold Foil model

Answer

Oil drop model

Question 5

Millikan determined the ___________ with the help of his oil drop experiment

Accepted Answer

charge and mass of the electron

Answer

charge and mass of the neutron

Answer

mass of the electron

Answer

Charge and mass of the protons

Question 6

What is the mass number and name of the element shown in the image?

Accepted Answer

127, Iodine

Answer

56, Iron.

Answer

39, Potassium

Answer

35, Chlorine

Question 7

According to the law of definite proportion, what happens to the mass ratio of elements in a compound?

Accepted Answer

It remains constant

Answer

It is determined by the amount of the compound

Answer

It depends on the pressure applied

Answer

It changes over time

Answer

It varies depending on the temperature

Question 8

Which one of the following compounds is according to the Law of Multiple proportions

Accepted Answer

CO and CO2

Answer

CO and NO

Answer

NaF and NaCl

Answer

FeO and KCl

Question 9

How many protons and neutrons does the element in the image have

Accepted Answer

79 protons and 118 neutrons

Answer

70 protons and 197 neutrons

Answer

50 protons and 197 neutrons

Answer

197 protons and 79 neutrons

Question 10

Identify the element shown in the image.

Accepted Answer

Au

Answer

Ag

Answer

Pb

Answer

Br

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