Atomic Structure

Which letter represents an electron?

• A

• B

• C

• D

• E

Tags

NGSS.MS-PS1-1

Which of the following is correct?

• Protons (positive);

  Neutrons (negative);

  Electrons (neutral)

• Protons (positive); Neutrons (neutral); Electrons (negative)

• Protons (negative);

  Neutrons (neutral);

  Electrons (positive)

• Protons (neutral);

  Neutrons (positive);

  Electrons (negative)

Tags

NGSS.MS-PS1-1

How many neutrons does Phosphorus have? ...remember APE MAN

• 46

• 31

• 15

• 16

Tags

NGSS.MS-PS1-1

What is the atomic number of this atom?

• 7

• 14

• 21

• 9

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NGSS.MS-PS1-1

Valence electrons determine an element's reactivity (chemical properties). How many valence electrons does this atom have?

• 8

• 2

• 1

• 11

Tags

NGSS.MS-PS1-1

What is the mass of this atom?

• 10

• 9

• 6

• 3

Tags

NGSS.MS-PS1-1

How many electrons can fit on the first two shells (energy levels)?

• 1 electron on the first and 2 electrons on the second

• 10 electrons on the first and 20 electrons on the second

• 2 electrons on the first and 8 electrons on the second

• 3 electrons on the first and 7 electrons on the second

Tags

NGSS.MS-PS1-1

Which of the following determines the identity of the element? (if you know this, then you can find out which element it is)

• The number of protons

• The mass

• The number of neutrons

• The number of electrons

Answer explanation

the mass can be different, even with the same element. For example, Carbon usually has a mass of about 12 amu, but there are carbons with a mass of 13 and even 14 amu. Electrons usually equal the protons, but electrons can be gained or lossed by an atom (ions)

Which is FALSE about the nucleus? Click all that apply

• It is the location of electrons

• It is where the mass of the atom is found

• It has an overall positive charge

• It can have a neutral charge

Tags

NGSS.MS-PS1-1

A student needs to know which element this is? What is the first thing she should be counting?

• A

• B

• C

• D

Answer explanation

She needs to know the number of protons. This is also the atomic number, which identifies the element.

Tags

NGSS.MS-PS1-1