Atomic Theory

If an atom has an atomic number of 37 and an atomic mass of 85, how many protons should it have?

• 48

• 37

• 85

• 122

If an atom has an atomic number of 37 and an atomic mass of 85, how many neutrons should it have?

• 48

• 37

• 85

• 122

An atom has 12 protons when it becomes an ion, how many total electrons will it have

• 12

• 14

• 10

• 8

Which subatomic particles are found in the nucleus of an atom?

• neutrons only

• protons only

• electrons only

• protons and electrons

• protons and neutrons

The mass of an atom is determined by -

• the total number of protons

• the total number of protons and electrons

• the protons and neutrons

• the charge of the nucleus

Which model of the atom visualized electrons orbiting in rings around the nucleus?

• Quantum model

• Plum pudding model

• Bohr model

• Nuclear model

The modern atom looks like -

• a small dense nucleus with a large electron cloud

• a solid sphere with protons, electrons, neutrons

• an equal distribution of protons and electrons

• a small indivisible sphere

What is the average atomic mass of a substance with 40% X-23 and 60% X-25?

• 24.2amu

• 22.4amu

• 23.5amu

• 25.3amu

Which scientist discovered the atom had a small, positively charged dense nucleus?

• Thompson

• Rutherford

• Dalton

• Democritus

Which scientist discovered atoms contain negatively charged particles called electrons?

• Thompson

• Rutherford

• Dalton

• Chadwick