Atomic Structure and Average Atomic Mass

What's a valence electron?

• electrons in the second energy level

• electrons in the outermost energy level

• the atomic number

• electrons in the first level

Tags

NGSS.MS-PS1-1

The nucleus is ____________ charged whereas the electron cloud is ____________ charged. 

• negatively, positively

• negatively, negatively

• positively, positively

• positively, negatively

Tags

NGSS.HS-PS1-8

Do the following atoms belong to the same element? Explain
       Aluminum-27
       An atom with 14 protons and 13 neutrons

• Yes because they have the same number of protons

• Yes because they have the same mass

• No because they have different number of protons

• No because they have different number of neutrons

What element is represented in this Bohr Model?

• Carbon

• Hydrogen

• Aluminum

• Lithium

Tags

NGSS.MS-PS1-1

What is the name of this element?

• Helium

• Hydrogen

• Argon

• Silver

Tags

NGSS.MS-PS1-1

What is atomic mass?

• The average mass that is weighted based on the abundance of the isotopes of the element

• The mass that is weighted based on the abundance of the isotopes of the element

• The average mass that is weighted based on the abundance of the protons of the element

• The average mass that is weighted based on the abundance of the neutrons of the element

Tags

NGSS.HS-PS1-8

The mass number is equal to the number

of ____ + the number of ____

• protons, neutrons

• protons, electrons

• neutrons, protons

• neutrons, electrons

What is an atomic number?

• of protons + # of electrons

• of electrons + # of neutrons

• the little number at the top of the Element symbol

What is an isotope?

• Atoms of the same element but different mass numbers

  Same protons, different neutrons

• Atoms of the same element but different mass numbers

  Same neutrons, different protons

• Atoms of the same element but have different atomic masses

What is Avogadro's number?

• The number of particles in exactly 1 mole

• The number of particles in a molecule

• 

Tags

NGSS.MS-PS1-1