Particles in the atom and Isotopes

Who introduced the term of atom for the first time

• Democritus

• Dalton

• Thomson

• Rutherford

• Niels Bohr

Which statement about atom is correct?

• Atoms contain proton and electron in the nucleus

• Protons are negatively charged

• Neutrons are negatively charged

• Location electron in the atom is in the nucleus

• Mass atom equal with the number of proton and neutron

What is mass number from Carbon?

• 6

• 12

• 16

• 8

• 10

What is the number of electron from sulfur?

• 16

• 14

• 12

• 18

• 32

Which one is bigger radius between Mg and Mg²⁺ ?

• Mg

• Mg²⁺

Which one is bigger radius between Mg²⁺ and Al³⁺ ?

• Mg²⁺

• Al³⁺

Which one is bigger radius between S and S^2- ?

• S

• S^2-

Which subatomic particle has no charge?

• Proton

• Neutron

• Electron

What is an atom’s nucleus made of?

Why mass number of an atom just consist of protons and neutrons, not included electrons?