ATOMIC STRUCTURE

Who is the proponent of the “Plum Pudding Model” of an atom?

• Niels Bohr

• John Dalton

• Ernest Rutherford

• Joseph John Thomson

A probable location of an electron around the nucleus in a quantum mechanical model is called a(n)_____.

• atomic orbital

• atomic cloud

• orbital cloud

• none of these

What happens to the charge of an atom when it loses an electron?

• It remains neutral.

• It becomes positive.

• It becomes negative.

• It remains the same.

This atomic model was proposed by Rutherford which the electrons are represented by a few mosquitos flying around the football field. What do you call of this model?

• Nuclear Model

• Plum pudding model

• Planetary Model

• Solid sphere model

Bohr's model of an atom is also called as _____.

• Nuclear Model

• Plum pudding model

• Solid sphere model

• Planetary Model

Electrons normally exist in the lowest energy state called _____.

• ground state

• excited state

• stationary state

• none of these

The element aluminum possesses 14 neutrons and 13 protons. What will be its mass number in the form of aluminum ion, Al3+?

• 13

• 14

• 16

• 18

An atom X contains 30 protons, 35 neutrons and 31 electrons. Which of the following is the correct isotopic symbol for this atom?

• 
• 
• 
• 

Why are atoms considered as electrically neutral?

• It is because all atoms contain neutrons.

• It is because there is an equal number of protons and electrons.

• It is because all subatomic particles lose their charges once they enter an atom.

• It is because the number of subatomic particles in the nucleus is always an even number.

Which subatomic particle is negatively charged?

• electron

• neutron

• positron

• proton