Isotopes and Radioactive Decay

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

Subatomic particles with a positive charge

• neutrons
• atomic mass
• protons
• isotopes

Measure mainly of the nuclear particles: protons + neutrons

• Subatomic Particles
• Atomic Number
• Atomic Mass
• Gluons

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-8

Value representing the number of protons in an element

• Atomic Mass
• Mass Number
• Valence Electrons
• Atomic Number

A tiny but very dense, positively charged portion of the atom that holds most of the atomic mass

• Electron Shells
• Orbitals
• Electron Cloud
• Nucleus

Arrangement of elements organized by atomic number

• Electron Cloud 
• Periodic Table 
• Electron Configuration
• None of these

Protium, Deuterium and Tritium are isotopes of the element Hydrogen.

Why does Tritium have a greater mass number than both Protium and Deuterium?

• It has more protons

• It has more neutrons

• It is electrically neutral

• It has more electrons

Tags

NGSS.MS-PS1-1

What is the mass number of a nitrogen atom that has 8 neutrons?

• 15

• 14

• 22

• 8

Tags

NGSS.MS-PS1-1

What is the mass number of an atom that contains 9 protons, 10 neutrons, and 9 electrons?

• 9

• 10

• 18

• 19

Tags

NGSS.MS-PS1-1

Scandium is an element with the symbol Sc. Which of the following statements are true about the isotope Scandium-45?

• This isotope has 45 protons

• The atomic number of this isotope is 45

• This isotope has 45 neutrons

• This isotope's nucleus contains 45 subatomic particles