What determines the atomic number of an element?

• The number of protons in the nucleus

• The number of neutrons in the nucleus

• The number of electrons in the outermost shell

• The total number of protons and neutrons

What role do valence electrons play in an atom?

• They determine the atomic number

• They contribute to the atom's mass

• They play a crucial role in chemical bonding

• They define the element's identity on the periodic table

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

What happens when an atom gains or loses electrons?

• It becomes an ion with a net charge

• It changes its atomic number

• It becomes electrically neutral

• It loses its identity on the periodic table

What happens to the atomic radius as you move down a group in the periodic table?

• It increases

• It decreases

• It remains the same

• It fluctuates

Which group in the periodic table is characterized by a lack of reactivity due to a complete valence shell?

• Noble gases (Group 8)

• Alkali metals (Group 1)

• Halogens (Group 7)

• Transition metals

Label the following item

a

b

c

Proton

Neutron

Electron

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NGSS.MS-PS1-1

The element Sulfur (S) has 16 protons. And it has ​ (a)   Valence electrons, while also containing ​ (b)   Energy Levels.

• 6
• 3
• 8
• 16
• 33
• 5

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NGSS.MS-PS1-1

Beryllium has how many protons?

Mathematical Equivalence

ON

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The number of energy shells in a lithium atom are ​ (a)  

• 2
• 6
• 9
• 3
• 5

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NGSS.MS-PS1-1

Which elements are in the same period?

• A & F
• F, B & D
• E & D
• F & B