Oxygen has 8 protons. What is oxygen's atomic number?

• 16
• 8
• 15.999
• 0

Tags

NGSS.MS-PS1-1

A neutral atom of Carbon-13 has ________ electrons and _________ neutrons

• 13, 13
• 6, 7
• 7, 7
• 6, 6

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-PS2-4

NGSS.HS-PS3-5

An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?

• 9.012, Beryllium
• 12.011, Carbon
• 6.941, Lithium
• 10.812, Boron

24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?

• 74.92 amu
• 24.97 amu
• 75.01 amu
• 74.51 amu

Calculate the average atomic mass of silver.

• 106.38649amu
• 111.91896amu
• 107.8677amu
• 121

Tags

NGSS.MS-PS1-1

An isotope has three forms.  30% have a mass of 4 amu, 20% have a mass of 5 amu and 50% have a mass of 3 amu.  Average atomic mass will be closest to

• 2 amu
• 3 amu
• 4 amu
• 5 amu

Identify #4

• proton

• neutron

• electron

• nucleus

Tags

NGSS.MS-PS1-1

Identify #3

• proton

• neutron

• electron

• nucleus

Tags

NGSS.MS-PS1-1

Identify #2

• proton

• neutron

• electron

• nucleus

Tags

NGSS.MS-PS1-1