6. Indicate whether each of the following statements is true or false. If false,

Question

6. Indicate whether each of the following statements is true or false. If false, correct the statement. (a) Effective nuclear charge stays about the same when one goes down a group. (b) Group 17 elements have seven electrons in their outer level. (c) Energy is given off when an electron is removed from an atom. (d) An electron transition from n -3 to n l gives off energy (e) Light emitted by an n 4 to n 2 transition will have a longer wavelength than that from an n 5 to n 2 transition. (f) A sublevel of ! 3 has a capacity of ten electrons

Explanation / Answer

A. The statement is false.

Effective nuclear charge decreases down the group. ( although nuclear charge increases down agroup, shielding effect more than counters its effect)

B. The statement is true. The Group 7 atoms have 7 valence electrons.

C. The statement is false as considerable amount of energy is required to remove an electron from an atom.

D. The statement is true. As a transition from n=3 to n=1 the amount of energy released is 1.93*10-18 J.

E. Statement is TRUE.

ENergy released from transition from n=4 to n=2 is less than n=5 to n=2. Since energy is inversely proportional to the wavelength so the lesser energy will be having longer wavelength

F. The statement is FALSE as maximum no of electrons that l=3 can hold is 8 not 10.

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