Periodic Table

To become positively charged, an atom must:

• Gain a proton

• Lose a proton

• Gain an electron

• Lose an electron

Noble gases are sometimes called "inert gases." What can you infer about the meaning of the word "inert" in chemistry?

• It refers to substances that easily lose electrons

• It refers to substances that do not react with other substances

• It refers to substances that have strong electrochemical charges

• It refers to gases

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NGSS.HS-PS1-2

If you wanted to find a sample of fermium, which has an atomic number of 100, where would you look?

• Deep within the Earth

• In the Earth's atmosphere

• In outer space

• In a science lab

What do the elements highlighted in red have in common?

• The same number of protons

• The same number of electrons

• The same number of neutrons

• The same number of electron shells

On the periodic table, how is atomic mass represented?

• As the masses of all the protons added together

• As the mass of the most common isotope

• As the exact mass of every atom

• As an average of the mass of different isotopes

Fluorine has an atomic number of 9. What can you conclude about an atom of fluorine from this fact?

• It has nine electron shells

• It has a boiling point of 9 degrees Celsius

• It has nine protons

• It weighs nine grams

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NGSS.MS-PS1-1

An atom of fluorine has an atomic mass of 19 u. Keeping in mind that its atomic number is 9, what can you infer about this atom?

• It has ten protons

• It has ten electrons

• It has ten neutrons

• It has nine neutrons

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NGSS.MS-PS1-1

If a sulfur atom has 16 protons, 16 electrons, and 16 neutrons, its atomic mass is:

• 16

• 32

• 48

• 64

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Fluorine is an element located on the right side of the periodic table of elements. What can you conclude about fluorine from this fact?

• It tends to form cations

• It tends to have a positive valence

• Its valence shell is nearly full

• It tends to donate electrons to other atoms

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What is the significance of the periodic table of elements? Choose the best answer.

• It lists all the different metals known to humans

• It predicts and lists all the chemical elements in the universe

• It explains where different atoms can be found

• It proves that atoms are the building blocks of matter

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