Atomic Theory Remediation Assignment

In an atom, electrons move in definite orbits around the nucleus.

• Thomson
• Rutherford
• Bohr
• Democritus

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Thomson
• Ernest Rutherford
• John Dalton
• Democritus

Who came up with the model of an atom pictured?

• J.J. Thompson
• Ernest Rutherford
• Neils Bohr
• James Chadwick

The first person to propose a theory about an atom called the Atomos Theory was

• Democritus
• Rutherford
• Dalton
• Aristotle

Which statement is incorrect?

• The nucleus is very dense.

• The nucleus contains protons and neutrons.

• The nucleus is positively charged.

• The nucleus is involved in chemical reactions.

Tags

NGSS.HS-PS1-8

The number of protons is equal to the number of electrons for an atom. This means an atom is-

• electrically neutral

• electrically positive

• electrically negative

What determines chemical reactivity?

• protons

• neutrons

• electrons

• isotopes

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What determines the identity of the atom?

• protons

• neutrons

• electrons

• isotopes

Which subatomic particle has a neutral charge?

• protons

• neutrons

• electrons

• isotope

What are atoms with the same number of protons but different numbers of neutrons?

• electrons

• protons

• neutrons

• isotopes