Protons, Neutrons, Electrons

Which particles are found in the nucleus of an atom?

• protons only

• neutrons only

• protons & electrons

• protons & neutrons

What subatomic particle is coloured red in this image?

• proton

• neutron

• electron

Tags

NGSS.MS-PS1-1

A neutron has what charge? (a)  

• Positive

• Negative

• It has no charge (it is neutral)

A proton has what charge?

An atom of tin has an atomic number of 50 and a mass number of 119. How many protons, electrons, and neutrons are found in one neutral atom of tin?

• 50 protons, 69 electrons, 50 neutrons

• 50 protons, 50 electrons, 69 neutrons

• 69 protons, 50 electrons, 69 neutrons

• 69 protons, 69 electrons, 50 neutrons

Tags

NGSS.MS-PS1-1

What is the mass number of an atom, and how is it calculated?

• The number of protons; calculated by adding protons and electrons.

• The number of electrons; calculated by subtracting neutrons from protons.

• The sum of protons and neutrons; calculated by adding protons and neutrons.

• The number of neutrons; calculated by subtracting electrons from protons.

Tags

DOK Level 2: Skill/Concept

Explain why the number of electrons in a neutral atom is equal to the number of protons.

• Because electrons and protons are the same particles.

• Because the charges of electrons and protons cancel each other out.

• Because neutrons balance the number of electrons.

• Because the atomic number is always even.

Tags

DOK Level 3: Strategic Thinking

How does the mass number differ from the atomic number in terms of atomic structure?

• Mass number includes electrons; atomic number does not.

• Mass number is the sum of protons and neutrons; atomic number is the number of protons.

• Mass number is the number of protons; atomic number is the sum of protons and neutrons.

• Mass number is the number of neutrons; atomic number is the number of electrons.

Tags

DOK Level 3: Strategic Thinking

How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?

• 72 protons, 178 neutrons, 106 electrons

• 72 protons, 106 neutrons, 72 electrons

• 178 protons, 250 neutrons, 72 electrons

• 106 protons, 72 neutrons, 106 electrons

Tags

112.20.b.5.A

What is the atomic number of an element, and what does it represent in an atom?

• The number of neutrons; it represents the mass of the atom.

• The number of protons; it represents the identity of the element.

• The number of electrons; it represents the charge of the atom.

• The sum of protons and neutrons; it represents the stability of the atom.

Tags

DOK Level 2: Skill/Concept