Atoms Test

What is an atom?

• The most basic unit of matter.

• A positively charged particle.

• A negatively charged particle.

• A particle with no mass.

Tags

NGSS.MS-PS1-1

Which of the following is the smallest?

• Proton

• Neutron

• Electron

• Atom

Almost the entire mass of an atom is located in the

• proton

• electron

• nucleus

• electron cloud

In the periodic table box in this picture, the 2 is the ____.

• atomic mass

• atomic number

• element name

• element symbol

The atomic number is the same as the number of these particles

• protons and neutrons

• protons and electrons

• electrons and neutrons

• protons, neutrons and electrons

What is the charge of a proton, neutron and electron?

• Protons are positive. Neutrons are negative. Electrons are neutral.

• Protons are neutral. Neutrons are positive. Electrons are negative.

• Protons are negative. Neutrons are neutral. Electrons are positive.

• Protons are positive. Neutrons are neutral. Electrons are negative.

What is located in the nucleus of an atom?

I. Protons

II. Neutrons

III. Electrons

• I only

• I and II

• I, II and III

• I and III

Use a copy of the periodic table and this picture to figure out what this is a picture of.

• An atom of carbon.

• An atom of magnesium.

• An atom of boron.

• An atom of nitrogen.

Tags

NGSS.MS-PS1-1

Barry draws a Bohr model for Lithium and shows it to his friends, Marty and Tyler. Marty and Tyler argue with Barry saying that is NOT a Bohr model for Lithium, but rather it is a model of Helium. Who is correct?

• Marty and Tyler are correct because an atom's identity is determined by the number of electrons it has. This is a model of Helium because it only has 2 electrons.

• Barry is correct because an atom's identity is determined by the number of protons it has. This is a model of Lithium because it has 3 protons.

• None of the boys are correct. An atom's identity is determined by both the number of electrons in the electron cloud and the number of protons in the nucleus. This is not a model of Lithium or Helium.

Tags

NGSS.MS-PS1-1

Calculate the number of protons, neutrons and electrons for Lithium.

• Protons = 3, Neutrons = 7, Electrons = 3

• Protons = 3, Neutrons = 4, Electrons = 3

• Protons = 4,

  Neutrons = 7,

  Electrons = 4

• Protons = 4, Neutrons = 4, Electrons = 4

Tags

NGSS.MS-PS1-1