Unit 1 Summative: Atoms & PT-08/07/2025 11:44

Which of the following statements is true with regard to isotopes?

• Isotopes of an element have the same number of protons but a different number of electrons.

• Isotopes of an element have the same number of electrons but a different number of protons.

• Isotopes of an element have the same number of protons but a different number of neutrons.

• Isotopes of an element have the same number of neutrons but a different number of protons.

Which statement correctly describes isotopes of carbon?

• Isotopes of carbon will have different atomic numbers but the same mass numbers.

• Isotopes of carbon will have the same atomic numbers but different mass numbers.

• Isotopes of carbon will have different atomic numbers and different mass numbers.

• Isotopes of carbon will have the same atomic numbers and the same mass numbers.

Tags

NGSS.MS-PS1-1

In the model below, what part of an atom does each letter represent?

• A: Electrons, B: neutrons, C: Protons

• A: neutrons, B: protons, C: electrons

• A: neutrons, B: electrons, C: protons

• A. electrons, B: neutrons, C: protons

Tags

NGSS.MS-PS1-1

Which number is used to identify an atom?

• Y is used because it does not vary in atoms of the same element.

• X is used because it does not vary in atoms of the same element.

• X is used because it represents the number of neutrons in an atom.

• Y is used because it represents the number of electrons in an atom.

Tags

NGSS.MS-PS1-1

The atomic number of an atom is defined as which of the following?

• mass in amu

• number of electrons

• mass in grams

• number of protons

Which statement about the atomic nucleus is correct?

• The nucleus is made of protons and neutrons and has a negative charge.

• The nucleus is made of protons and neutrons and has a positive charge.

• The nucleus is made of electrons and has a positive charge.

• The nucleus is made of electrons and has a negative charge.

Using the information in the image above, what materials will the students need to build a typical sodium atom with an atomic mass of 23?

• 5 baseballs, 5 marbles, 1 tennis ball

• 11 baseballs, 11 marbles, 12 tennis balls

• 11 baseballs, 12 marbles, 11 tennis balls

• 12 baseballs, 11 marbles, 11 tennis balls

Tags

NGSS.MS-PS1-1

How does a carbon-14 atom differ from a carbon-12 atom?

• Carbon-14 has more protons than carbon-12.

• Carbon-14 has fewer neutrons than carbon-12.

• Carbon-14 has fewer protons than carbon-12.

• Carbon-14 has more neutrons than carbon-12.

A neutral atom of which element contains 10 electrons?

• boron

• fluorine

• lithium

• neon

Which of the following statements must be true about a neutral atom?

• The atom must have an even number of protons.

• The atom must have as many neutrons as protons.

• The number of electrons and protons in the atom must be equal.

• All of the atom's electrons and protons must be in the nucleus.