3.6-3.7 Midunit Review (PS) 2025

According to the scientific theory of atoms, which of the following statements best describes the location of electrons?

• in the nucleus of the atom

• both in the nucleus and around it

• outside the nucleus and often far from it, in the electron cloud

• outside the nucleus, in very rigid orbits around the nucleus

The nucleus of most atoms is composed of which of the following sub-atomic particles?

• tightly packed protons

• tightly packed neutrons

• tightly packed protons and neutrons

• loosely connected protons and electrons

Which scientist discovered the atom is made up of mostly empty space with a small, dense, positively charged nucleus?

• Niels Bohr

• Ernest Rutherford

• J.J. Thompson

• John Dalton

The image above shows a model of the atom. Which subatomic particle does the arrow in the image above identify?

• electron

• neutron

• orbital

• proton

Tags

NGSS.MS-PS1-1

Which person proposed the atomic model seen below?

• Bohr

• J.J. Thompson

• Rutherford

• Democritus

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NGSS.MS-PS1-1

Which of the following statements was part of Dalton’s atomic theory? Choose all that apply.

• All elements are composed of atoms.

• Atoms are indivisible.

• Compounds are formed by joining two or more atoms.

• Atoms of the same element have different masses and properties.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which scientist's model proposed each electron in a specific energy level or orbital?

• Ernest Rutherford

• Niels Bohr

• John Dalton

• J.J. Thompson

What two subatomic particles add together to calculate the mass number of an atom?

• protons and electrons

• neutrons and electrons

• protons and neutrons

• orbitals and electrons

What subatomic atomic particle determines the identity of the atom?

• proton

• electron

• neutron

• nucleus

What subatomic particle is always equal to the atomic number?

• proton

• electron

• neutron

• nucleus