Question

1. the place where electrons are most likely to be found is called

______.

electron cloud
nucleus
electron universe
molecule

1. atoms of the same element that differ in number of neutrons are called

______.

ions
valence electrons
molecules
isotopes

1. heat energy and gravity are made of matter.

true
false

Explanation:

• Q7: The electron cloud is defined as the region where electrons are most likely to be found. The nucleus contains protons and neutrons, electron universe is not a scientific term, and molecules are groups of atoms.
• Q8: Isotopes are atoms of the same element with different neutron numbers. Ions are charged atoms, valence electrons are outer-shell electrons, and molecules are atom groups.
• Q6: Matter has mass and volume. Heat energy is energy, gravity is a force—neither is matter.

Answer:

Q7: Electron Cloud
Q8: isotopes
Q6: False