The atomic number of an atom equals the number of…

• neutrons

• protons

• electrons + neutrons

• energy levels

Which particles are found in the nucleus?

• Protons

• Neutrons

• Electrons

Identify the model: solid sphere, plum pudding, nuclear, planetary, or quantum.

Tags

NGSS.MS-PS1-1

Put these in chronological order (1 = oldest → 5 = newest): nuclear model, quantum model, solid sphere model, planetary model, plum pudding model

• Plum pudding

• Planetary model

• Quantum model

• Solid sphere

• Nuclear model

Electrons have nearly the same mass as protons. ________

• True

• False

Tags

NGSS.MS-PS1-1

Which model first proposed a tiny, dense, positive nucleus?

• Plum pudding

• Nuclear

• Planetary

• Quantum

The gold-foil experiment most strongly supports which model?

• Solid sphere

• Plum pudding

• Nuclear

• Quantum

Tags

NGSS.HS-PS1-8

On a periodic-table tile, the atomic mass is basically the…

• whole number counting protons

• sum of protons and neutrons

• total electrons

• group number

Chlorine-35 (35- atomic mass) has atomic number 17. How many neutrons does it have?

Tags

NGSS.MS-PS1-1

Boron-11 (11- atomic mass) has atomic number 5. How many neutrons does it have?