Answer:
21 L
Explanation:
Please see the step-by-step solution in the picture attached below.
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Answer:
D) Group 18
Explanation:
Elements in group 18 doesn't't possess any of the properties above
Answer:
When an electron moves from a higher to lower orbital, energy is released as waves of light.
Explanation:
The energy from the flame excites the electrons to orbitals of higher energy.
When the electrons drop to lower-energy orbitals, they release the excess energy as light waves.