PS Midterm S1 Study Guide

Which of these statements is true?

• the electrons have a negative charge and are in the nucleus

• the neutrons have a neutral charge and help stabilize the atom

• the protons have a negative charge and are in the nucleus

• the electrons have a positive charge and orbit the nucleus in the electron cloud

Tags

NGSS.MS-PS1-1

Fluorine has a mass of 19 and an atomic number of 9. How many neutrons does it have?

• 10

• 9

• 19

• 28

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NGSS.MS-PS1-1

Carbon has 6 protons, 7 neutrons, and 6 electrons. What is its atomic number?

• 7

• 6

• 14

• 13

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NGSS.MS-PS1-1

Which of the following do you NOT need to know how to make a Bohr model?

• atomic number

• atomic mass

• the charge

• whether it is a solid, liquid, or gas at room temperature

Sally Jo has an unknown element in group 1. How many valence electrons does this element have?

• 1

• 2

• 8

• the answer cannot be determined

Which statement correctly describes the change from a neutral atom of an element to its ion, according to the periodic table?

• a Phosphorus atom forms a P3- ion by gaining 3 electrons

• a Fluorine atom forms a F1- ion by losing one electron

• a Magnesium atom forms a Mg2+ ion by gaining 2 electrons

• a Sodium atom forms a Na1+ ion by losing 2 electrons

what is the best reason to use models like these to depict elements?

• to show the different isotopes of the atom

• to show the valence electrons of an atom

• to compare the different sizes of atoms

• to show the atomic number of the atom

Tags

NGSS.MS-PS1-1

What about a positively charge ion is true?

• it's formed when an atom loses electrons

• it has more electrons than protons

• it's formed when an atom gains protons

• it's found in groups 15, 16, and 17

Which group on the periodic table has a 1+ charge?

• red

• pink

• lime green

• medium blue

Which group on the periodic table has a full outer shell and does NOT react with other elements?

• dark blue

• yellow

• pink

• dark green