Unit 2 Review – Electron Arrangement and the Periodic Table

subatomic particles found on the outermost shell & responsible for the atom's reactivity

• neutrons
• valence electrons
• isotopes
• ions

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Value representing the number of protons in an element

• Atomic Mass
• Mass Number
• Valence Electrons
• Atomic Number

Where electrons are likely to be found as they travel around the nucleus

• Nucleus
• Electron Cloud
• Within a Proton
• Within a Neutron

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NGSS.MS-PS1-1

What is one way Neutrons are different from electrons?

• they both are negative

• neutrons have no charge, while electrons have a negative charge

• Both are in the nucleus( center of atom)

• Electrons are inside nucleus and neutrons are outside the nucleus.

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NGSS.MS-PS1-1

What is the atomic number?

• 35

• 18

• 17

• 52

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NGSS.MS-PS1-1

How many protons and electrons does this element have?

• 35

• 18

• 17

• 52

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NGSS.MS-PS1-1

How many neutrons does calcium have?

• 20

• 40

• 60

• 0

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NGSS.MS-PS1-1

What is the atomic mass of Arsenic?

• 33

• 107

• 75

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NGSS.HS-PS1-1

An element's identity is determined by the number of

• electrons.
• protons.
• neutrons.
• valence.

What was Dmitri Mendeleev's greatest contribution to the history of the periodic table?

• He arranged all of the known elements by their atomic number
• He realised that there was a pattern of reactivity which repeated every 8 elements
• He predicted the existence (and properties) of new elements
• He identified the "law of triads" which became the groups