Homework 01 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)

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

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

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)

How many elements are in this compound formula [H₂O₂ ]?

• 2

• 4

• 8

• 1

Tags

NGSS.MS-PS1-1

What is this subatomic particle that has positive charge?

• Electron

• Neutron

• Proton

• Megatron

What are the subatomic particles?

• Protons, Electrons, Neutrons

• Molecules, and atoms

• Electrons, Protons, Nucleus

• Nucleus, and Electrons

What is this subatomic particle that has no charge?

• Electron

• Neutron

• Proton

• Megatron