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Chapter 6: Q58E (page 336)

Question:Which of the following atoms contains only three valence electrons: Li, B, N, F, Ne?

Short Answer

Expert verified

Boron contains only 3 valence electrons.

Step by step solution

01

checking if Li and B have just three valence electrons or not  

Li has 1 electron in its 2s orbital. so, it has 1 valence electron. Boron has 2 electrons in 2s orbital, 1 electron in 3p. that accounts for a total of 3 valence electrons.

02

checking if N, F, and Ne have just three valence electrons or not  

N has a total of 5 valence electrons. F has a total of 7 valence electrons. Neon is an inert gas of group 18 and it has filled s and p orbitals, hence a total of 8 valence electrons.

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Most popular questions from this chapter

Which of the following atoms and ions is (are) isoelectronic with\({{\bf{S}}^{{\bf{2}} + }}:{\rm{ }}{\bf{S}}{{\bf{i}}^{4 + }}{\rm{ ,}}{\bf{C}}{{\bf{l}}^{{\bf{3}} + }},{\rm{ }}{\bf{Ar}},{\rm{ }}{\bf{A}}{{\bf{s}}^{{\bf{3}} + }},{\rm{ }}{\bf{Si}},{\rm{ }}{\bf{A}}{{\bf{l}}^{{\bf{3}} + }}\)?

Question: Based on their positions in the periodic table, predict which has the smallest atomic radius: Mg, Sr, Si, Cl, I.

Identify the subshell in which electrons with the following quantum numbers are found:

(a)\({\bf{n = 3,l = 1}}\);

(b)\({\bf{n = 5,l = 3}}\);

(c)\({\bf{n = 2,l = 0}}\).

Describe the properties of an electron associated with each of the following four quantum numbers:n,l,ml, andms.

Question: State the Heisenberg uncertainty principle. Describe briefly what the principle implies.
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