Isotopes Practice

An atom's atomic mass comes from its

• Nucleus
• Electron cloud
• Protons
• Electrons

Tags

NGSS.HS-PS1-8

Q.Aluminum-24 contains ___ protons, ____ neutrons and ____ electrons

• 13 p, 13 n, 13 e

• 24 p, 24 n, 24 e

• 13 p, 24 n, 13 e

• 13 p, 11 n, 13 e

Tags

NGSS.MS-PS1-1

Q.An atom with 19 protons, 20 neutrons and 19 electrons is...

• Potassium-20

• Potassium-39

• Calcium-20

• Calcium-39

Tags

NGSS.MS-PS1-1

Q.You have a sample of neon atoms - Neon-21 and Neon-22. Which one contains more protons?

• they have the same number of protons

• Ne-22 has more protons

• Ne-21 has more protons

• we need more info to answer this question

A neutral atom of the isotope ²⁶₁₂Mg would consist of

• 12 protons, 26 neutrons, 26 electrons
• 26 protons, 12 neutrons, 26 electrons
• 26 protons, 14 neutrons, 14 electrons
• 12 protons, 14 neutrons, 12 electrons

Tags

NGSS.MS-PS1-1

Isotopes of the same element have the same number of 

• protons
• neutrons
• electrons
• not enough information

Iron-60 (atomic number 26) is an isotope that is often used to study meteorites.  How many neutrons does iron-60 have?

• 26
• 60
• 34
• 86

Four isotopes of lead include lead-204, lead-206, lead-207, and lead-208. The average atomic mass of lead is 207.2. Which isotope of lead is likely to be the most common?

• 204

• 206

• 207

• 208

What is the mass number of bromine?

• 35

• 45

• 80

• 79.904

How many neutrons does this bromine atom have?

• 35

• 45

• 80

Tags

NGSS.MS-PS1-1