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Chapter 4: Q. 4.45 (page 120)

Electron can move to higher energy levels when they_____(emit/absorb) energy.

Short Answer

Expert verified

Electron move to higher energy levels by absorbing energy.

Step by step solution

01

Given information.

We have been given that,

Electron, energy levels

When electrons go to higher energy levels, we must declare whether they emit or absorb energy.

02

Simplify.

  • Electron with lower energy absorb specific amount of energy when they move to higher energy levels.
  • By Bohr's model, electrons tries to revolve around shells and each energy level has has specific amount of energy. Energy keeps increasing from lower shells to higher shells. The electrons in lower shells has low energy so, it must absorb energy energy to move into higher shell.
  • Electrons absorb energy and excite, moving from a lower to a higher energy level.

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Write the names and symbols for the elements with the following atomic numbers:

a. 3 b. 9 c. 20 d. 30

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c. How are they different?

d. Why is the atomic mass of argon listed on the periodic table, not a whole number?

e. Which isotope is the most abundant in a sample of argon?

Electron drop to lower energy levels when they____(emit/absorb) energy.

Place the elements in each set in order of decreasing atomic size.
a. Cl, S, P
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d. S, O, Se
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