periodic table shi

how many electrons are the 6th shell

• 2

• 16

• 32

• 8

what is an metalloids

• Metalloids are elements that are purely metallic.
• Metalloids are only found in liquid form.
• Metalloids are elements with properties of both metals and nonmetals.
• Metalloids are elements that have no electrical conductivity.

How many valence electrons?

• 2

• 3

• 4

• 5

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NGSS.MS-PS1-1

whats an valence electron

• Electrons that are always found in the nucleus of an atom.
• Electrons that are responsible for the mass of an atom.
• Electrons that are involved in the formation of isotopes.
• Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.

a material that allows heat or electricity flow though easily

• Insulator
• Resistor
• Semiconductor
• Conductor

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NGSS.MS-PS3-3

NGSS.MS-PS3-4

whats the percentage of nitrogen and oxygen in the atmosphere

• Nitrogen: 50%, Oxygen: 30%
• Nitrogen: 90%, Oxygen: 5%
• Nitrogen: 60%, Oxygen: 35%
• Nitrogen: 77%, Oxygen: 21%

what is the name of group 1

• Noble gases
• Halogens
• Transition metals
• Alkali metals

whats an physical change

• A physical change is a change that does not affect the chemical composition of a substance.
• A physical change is a process that cannot be reversed.
• A physical change involves a reaction that produces new substances.
• A physical change alters the chemical structure of a substance.

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NGSS.MS-PS1-4

whats an chemical change

• A chemical change is a process that only involves physical alterations of substances.
• A chemical change is a process where substances/molecule level

• A chemical change is when substances remain the same but change their appearance.
• A chemical change is when substances are mixed without any reaction occurring.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

amu

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NGSS.MS-PS1-5