Life Science: Second Semester Test

Almost all the mass of an atom is located in its

• Protons

• Electrons

• Nucleus

Tags

NGSS.MS-PS1-1

An electron is a particle with

• A negative charge, found in the nucleus.

• A positive charge, found in the nucleus.

• A negative charge, found outside the nucleus.

Which particle is the least massive?

• Proton

• Electron

• Neutron

All atoms of an element have the same

• Mass number

• Atomic number

• Number of isotopes

The number of neutrons in an atom equals the

• Mass number minus the atomic number.

• Atomic number plus the number of electrons.

• Atomic number minus the mass number.

The atomic number of sulfur is 16. How many electrons are in an atom of sulfur-34?

• 16

• 18

• 34

Tags

NGSS.MS-PS1-1

Electrons in the first energy level of an atom

• Have no energy

• Have the lowest possible energy

• Have the highest possible energy

Match the Scientist with their contribution to the Atomic Theory.

Atoms are small and sphere shaped.

• Democritus

• Dalton

• Thomson

• Rutherford

• Bohr

Match the Scientist with their contribution to the Atomic Theory.

Named atoms - atomos

• Democritus

• Dalton

• Thomson

• Rutherford

• Bohr

Match the Scientist with their contribution to the Atomic Theory.

Atoms are mostly positive, with negatives spread throughout

• Democritus

• Dalton

• Thomson

• Rutherford

• Bohr