Atomic Mass and Compound Analysis

What is the average atomic mass of an element with two isotopes: one with a mass of 10 amu and an abundance of 20%, and another with a mass of 11 amu and an abundance of 80%?

• 10.2 amu

• 10.8 amu

• 11.0 amu

• 10.5 amu

Which element has the highest atomic mass in the first period of the periodic table?

• Hydrogen

• Helium

• Lithium

• Beryllium

• 35.5 amu

• 36.0 amu

• 35.0 amu

• 37.0 amu

Which of the following elements is located in Group 2 of the periodic table?

• Sodium

• Magnesium

• Aluminum

• Potassium

What is the atomic mass of carbon as listed on the periodic table?

• 12.01 amu

• 14.01 amu

• 16.00 amu

• 1.01 amu

Which element has the smallest atomic radius in the third period of the periodic table?

• Sodium

• Magnesium

• Chlorine

• Argon

Tags

NGSS.HS-PS1-1

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

Which element is known for having the highest electronegativity?

• Fluorine

• Oxygen

• Nitrogen

• Chlorine

Tags

NGSS.HS-PS1-2

What is the average atomic mass of an element with isotopes of masses 20 amu (90% abundance) and 22 amu (10% abundance)?

• 20.2 amu

• 21.0 amu

• 20.0 amu

• 22.0 amu

Which of the following elements is a noble gas?

• Nitrogen

• Oxygen

• Neon

• Hydrogen

Tags

NGSS.HS-PS1-1