SPH 3U1 - Energy - Atoms & Isotopes

Which of the following ancient Greeks first theorized that all material things were composed of extremely small irreducible particles?

• Aristotle

• Socrates

• Democritus

• Euclid

Most of an atom consists of

• empty space

• electrons

• protons

• gravity

Which of the following terms is used to describe the particles in the nucleus of an atom?

• electrons

• nucleons

• protozoa

• positrons

 For atoms in their neutral state, which of the following is true?

• There are more protons than electrons.

• There are fewer protons than electrons.

• The number of protons and electrons is the same

• The electrons outweigh the nucleons.

Which of the following scientists fired positively charged particles at gold foil and found that some particles scattered?

• Dalton

• Bohr

• Rutherford

• Aristotle

The nucleus of an atom consists of which of the following particles?

• protons and electrons

• protons and neutrons

• neutrons and electrons

• protons, neutrons and electrons

Atoms that have electrons in their lowest energy levels are said to be in their

• normal state

• level state

• excited state

• ground state

Which particle can only occupy certain energy levels and circles the nucleus of an atom?

• proton

• neutron

• electron

• positron

All isotopes of any one chemical element have the same

• number of neutrons

• number of protons

• atomic mass

• mass number

Electrons can only occupy certain energy levels.

• True

• False