Radioactive decay

A helium nucleus with two protons and two neutrons is called a(n) ____.  

• alpha particle
• electroscope
• beta particle
• gamma ray

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NGSS.HS-PS1-8

Which type of nuclear radiation is being emitted here?

• Alpha
• beta
• gamma 
• none

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NGSS.HS-PS1-8

How many neutrons are in this isotope of Uranium?

• 235
• 92
• 327
• 143

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NGSS.HS-PS1-8

What is likely to happen to unstable nuclei with too many, or too few, neutrons?

• They will decay by emitting radiation.

• They will loose all their electrons.

• They will bond with other atoms.

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NGSS.HS-PS1-8

If the nucleus has too few neutrons, it will emit two protons and two neutrons called ___________.

• an alpha particle

• a beta particle

• a neutron

• gamma radiation

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NGSS.HS-PS1-8

Alpha decay causes the mass number of the nucleus to decrease by ________ and the atomic number of the nucleus to decrease by _______.

• four, two

• two, four

• one, two

• two, three

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NGSS.HS-PS1-8

Beta radiation is ____________________

• an electron from an electron shell.

• an electron from the nucleus.

• two protons and two neutrons.

• a high frequency electromagnetic wave.

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NGSS.HS-PS1-8

Describe the structure of an alpha particle.

• a fast-moving electron

• 2 protons and 2 neutrons

• a slow-moving neutron

• a hydrogen nucleus

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NGSS.HS-PS1-8

The mass number of Neptunium (Np) is _____.

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NGSS.HS-PS1-8

The atomic number of Neptunium (Np) is _____.