Question

20 multiple choice 1 point
when one electron hinders another electron from feeling attraction from the nucleus, that electron is ______ the other.
○ moving
○ screening
○ electrifying
○ swarming
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21 multiple choice 1 point
the attractive force between an electron in a many - electron atom and its nucleus after taking electron screening into account is the definition of...
○ screening constant.
○ coulomb’s law.
○ effective nuclear charge.
○ shells.
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Explanation:

Question 20

In atomic physics, the phenomenon where one electron reduces the nuclear attraction felt by another electron is called "screening". "Moving" is too general, "electrifying" refers to charging, and "swarming" is about a group moving, so "screening" fits.

The effective nuclear charge is defined as the attractive force between an electron in a many - electron atom and its nucleus after considering electron screening. The screening constant is related to the extent of screening, Coulomb's law is a general law of electrostatic force, and shells are electron energy levels. So the correct option is about effective nuclear charge.

Answer:

B. screening

Question 21