SCIENCE 9: QUANTUM MECHANICS:ATOM

What subatomic particle has a positive charge?

• Proton

• Electron

• Neutron

• Isotope

A small, dense region composed of protons and neutrons at the center of an atom.

• Electron

• Isotope

• Nucleus

• Orbital

Which of the following is responsible for the mass of an atom?

• Neutrons and electrons

• Protons and neutrons

• Protons only

• Neutrons only

A subatomic particle with a negative charge.

• Protons

• Neutrons

• Electrons

• Isotope

The number of _______ in one atom of an element determines the atom's identity.

• Protons

• Electrons

• Neutrons

• Isotope

The atomic _____ tells you how many protons are there in an atom.

• size

• mass

• weight

• number

The arrangement of electrons in energy levels around an atomic nucleus.

• Electron shell

• Electron affinity

• Electron configuration

• Electrical charge

A negatively charged particle, located in the outermost shell of an atom.

• Valence electron

• Muon

• Neutrino

• Lepton

An element which has the same number of protons and electrons having no net charge.

• Isotope

• Ion

• Neutral atom

• Electron

This universal law states that like charges repel and unlike charges attract.

• Law of interaction

• Law of conservation of mass

• Law of attraction

• Law of repulsion