Chemistry

The number of protons in the nucleus of an atom is known as the ______ of that element.

• mass number

• atomic number

• electron count

• nucleus

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NGSS.HS-PS1-8

Select one of these statements on Chlorine that is incorrect:

• The mass number for Chlorine is 35

• The atom number for Chlorine is 17

• A Cl^- ion would have 18 electrons

• ¹⁷₃₅Cl has 17 neutrons within its nucleus

Tags

NGSS.HS-PS1-1

The chemical properties of an element are determined by its _____.

• atomic number

• mass number

• number of neutrons

• number of electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How do negative ions form?

• An element losing an electron

• An element gaining an electron

• An element losing a neutron

• An element losing a proton

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which one of the following statements on isotopes is correct?

• Isotopes are atoms of the same element, but with different atomic numbers

• Isotopes are atoms of different elements, but with the same mass number

• Isotopes are atoms of the same element with the same atomic number, but different mass numbers

• Isotopes of the same element have different chemical properties

What is the name of atom number 2?

• Neon

• Argon

• Chlorine

• Sodium

Tags

NGSS.HS-PS1-1

This image represents isotopes of a certain element. Can you name the element?

• Nitrogen

• Oxygen

• Carbon

• Fluorine

Tags

NGSS.HS-PS1-8

This is an element with 13 neutrons in its nucleus. Name the element, if A = 24?

• Mg

• Na

• Cr

• Al

Which of the following is the correct order for electrons filling in orbitals?

• 4s, 3d, 4p, 4d

• 2p, 3s, 3p, 3d

• 3s, 3p, 4s, 3d

• 1s, 2s, 2p, 2d

Tags

NGSS.HS-PS1-1

How many electrons are there in the “p’ orbitals of the last shell (principal energy level) of potassium, atomic number 19?

• 0

• 2

• 3

• 1

Tags

NGSS.HS-PS1-1