Unit 1: Atomic Structure QUIZ Review

Which of the following is defined as an element’s atomic number?

• 1. Number of electron shells in each atom

• 1. Number of protons contained in each atom

• 1. Number of neutrons contained in each atom

• 1. Number of nuclei contained in each atom

Which of the following statements about this atom is TRUE?

• The atom has a net positive charge

• The atom has a net negative charge

• The atom has a neutral charge

• The electrical charges do not balance

Tags

NGSS.MS-PS1-1

Which of the following best describes an electron?

• It has no charge and about the same mass as a proton.

• It has a negative charge and much less mass than a proton.

• It has a positive charge and much more mass than a neutron.

• It has a negative charge and about the same mass as a neutron.

Tags

NGSS.MS-PS2-3

Which of the following is the mass number of an element?

• Number of protons + Number of neutrons in each atom

• Number of protons + Number of electrons in each atom

• Number of neutrons + Number of electrons in each atom

• Number of protons + number of neutrons + number of electrons in each atom

Tags

NGSS.MS-PS1-1

An atom has 30 protons, 30 neutrons and 30 electrons. What is the charge of the atom's nucleus?

• +30

• +60

• -30

• +90

The picture below shows the sodium atom. Sodium is a highly reactive metal. What characteristic of sodium is most closely related to its chemical reactivity?

• The 11 electrons in each atom of sodium

• The density of sodium which is 0.91 g/cm3

• The atomic mass of sodium, which is 22.98 amu

• The 1 valence electron in each atom of sodium

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following is TRUE?

• Helium is a stable element because its outer shell of electrons is full.

• Helium is a stable element because its outer shell of electrons is not full.

• Helium is not stable element because its outer shell of electrons is not full.

• Helium is not a stable element because its outer shell of electrons is full.

Tags

NGSS.MS-PS1-1

What is the mass number of a potassium (K) atom that has 20 neutrons and has an atomic number of 19?

• 18

• 19

• 20

• 39

Which one of the following correctly describes an atom's identity and chemical properties?

• Protons and neutrons determine an atom's identity, whereas the electron cloud determine the atom's chemical properties

• Protons determine an atom's identity, whereas valence electrons determine the atom's chemical properties.

• The electron cloud determines an atom's identity, whereas valence electrons determine the atom's chemical properties.

• Valence electrons determine an atom's identity, whereas, the electron cloud determines its chemical properties.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

An atom of a certain element has 37 protons, 37 electrons, and a mass number of 85. How many neutrons are in this atom?

• 36

• 48

• 47

• 63