Atoms and Molecules 2 - Connection

A section of the Periodic Table of Elements is provided. What is the chemical symbol for magnesium?

• 12
• Mg
• 24.31
• Magnesium

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NGSS.MS-PS1-1

Which part of the atom is responsible for most of its mass?

• Electrons

• Protons and neutrons

• Only protons

• Only neutrons

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UT.CS.SCI.8.8.1.1

Label the parts of this carbon atom

a

b

c

d

Electron

Neutron

Proton

Nucleus

Tags

NGSS.MS-PS1-1

If you are given the atomic number and mass number of an element, how would you determine the number of neutrons in its atom? Use reasoning to explain your answer.

• Subtract the atomic number from the mass number.

• Add the atomic number and mass number.

• Subtract the mass number from the atomic number.

• Divide the mass number by the atomic number.

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UT.CS.SCI.8.8.1.1

You are asked to create a model of a nitrogen atom using colored balls to represent subatomic particles. If you have blue balls for protons, red balls for neutrons, and green balls for electrons, how would you plan your model to accurately represent a neutral nitrogen atom, and why?

• Use 7 blue, 7 red, and 8 green balls, because nitrogen has 7 protons, 7 neutrons, and 8 electrons.

• Use 7 blue, 7 red, and 7 green balls, because a neutral nitrogen atom has equal numbers of protons and electrons.

• Use 8 blue, 7 red, and 7 green balls, because nitrogen has 8 protons.

• Use 7 blue, 8 red, and 7 green balls, because nitrogen has more neutrons than protons.

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UT.CS.SCI.8.8.1.1

Which subatomic particles are found in the nucleus of an atom?

• Protons and electrons

• Protons and neutrons

• Neutrons and electrons

• Only electrons

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UT.CS.SCI.8.8.1.1

• 11 protons, 12 neutrons, 11 electrons; because atomic number is 11 and mass number minus atomic number gives neutrons.

• 12 protons, 11 neutrons, 12 electrons; because sodium has 12 protons.

• 11 protons, 11 neutrons, 12 electrons; because sodium has 11 protons and electrons.

• 12 protons, 12 neutrons, 11 electrons; because sodium has 12 protons and 12 neutrons.

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UT.CS.SCI.8.8.1.1

What is the charge of a neutral atom?

• Positive

• Zero

• Negative

• It depends on the number of neutrons

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UT.CS.SCI.8.8.1.1

What does the atomic number of an element represent?

• The number of neutrons in the atom

• The number of protons in the atom

• The number of electrons in the atom

• The total number of protons and neutrons

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UT.CS.SCI.8.8.1.1

You are asked to explain why atoms are considered mostly empty space. Which reasoning best supports this statement?

• The nucleus is very small compared to the overall size of the atom, and electrons are spread out far from the nucleus.

• Atoms are solid throughout because of the dense nucleus.

• Electrons fill all the space in the atom, leaving no empty space.

• The protons and neutrons take up most of the atom’s volume.

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UT.CS.SCI.8.8.1.1