Atoms, electrons, nuclear decay

What is the maximum number of electrons that the third shell can hold?

• 2

• 8

• 18

• 32

An isotope with an unstable nuclei is called

• an isotopic nuclei

• a covalent nuclei

• a radioisotope

• a radionucleus

If you know an element's atomic number, you also know...

• the number of protons.

• the number of neutrons.

• the atomic mass.

• how the element will react.

What does an atom emit during alpha decay?

• a helium nucleus

• an electron

• high-energy waves

• a proton

What does an atom emit during beta decay?

• a proton

• a neutron

• an electron

• high-energy waves

If an atom of potassium-40 (K) goes through gamma decay, what would you have at the end?

• Potassium-40

• Calcium-40

• Argon-35

• Potassium-39

In order of most to least penetrating radiation we have

• Alpha , Beta,  Gamma
• Beta , Gamma , Alpha
• Gamma, Beta, Alpha
• Gamma, Alpha, Beta

Tags

NGSS.HS-PS1-8

What do carbon-12 and carbon-14 have in common? 

• They have the same number of protons
• They have the same number of neutrons
•  They have the same atomic mass
• They have the same atomic weight

Tags

NGSS.HS-PS1-8

If we start off with element ⁵⁰₂₄X after an alpha decay we get another element Y that looks like

• ⁵⁰₂₂Y
•  ⁴⁶₂₂Y
• ⁴⁸₂₀Y
• ⁵⁴₂₆Y

Tags

NGSS.HS-PS1-8

Bohr found that when atoms absorb precise amounts of energy (quanta), the electron(s) will

• move to another atom.
• fall into the nucleus.
• move to higher energy levels.
• go to ground state.