Average Atomic Mass & Isotopes

Which of these determines the identity of an atom?

• proton

• neutron

• valence electron

• protons and neutrons

In the notation ²⁸⁹₁₁₅ Mc, the number 289 is the

• mass number

• atomic number

• number of neutrons

• number of electrons

How many protons does this isotope of titanium have?

• 48
• 22
• 26
• 70

Tags

NGSS.MS-PS1-1

How many neutrons does this isotope of titanium have?

• 48

• 22

• 26

• 70

Tags

NGSS.MS-PS1-1

The name of this isotope of titanium is

• titanium-48

• titanium-22

• titanium-26

Tags

NGSS.MS-PS1-1

Iodine-129 has _ protons

(a)  

Tags

NGSS.MS-PS1-1

Iodine-129 has _ neutrons

(a)  

Tags

NGSS.MS-PS1-1

What is the mass in this isotope?

• 8
• 3
• 4
• 5

Tags

NGSS.MS-PS1-1

How many neutrons does the isotope below have?     ⁸⁹ ₃₆Kr

• 53
• 36
• 89
• 125

The symbol for a substance containing 76 protons and 114 neutrons is

• Osmium-114

• Osmium-76

• Osmium-190