How many unpaired electrons are there in a K^+ ion? 0 1 2 5 What is the formula

Question

How many unpaired electrons are there in a K^+ ion? 0 1 2 5 What is the formula of dinitrogenpentaoxide? NO_5 N_2O_4 N_2O_5 N_2O_10 A 5.2 cm^3 volume of a substance has a mass of 12.436 g. What is its density? 2.39153846 g/cm^3 2.3915 g/cm^3 2.39 g/cm^3 2.4 g/cm^3 2 g/cm^3 How many electrons are there in a Cr^3+ ion? 3 21 24 27 Consider the ion NO^-. What is the bond order? 0 1.5 2 2.5 3 Is the ion from question 5 paramagnetic? Yes no impossible to tell The molecular polarity of CF_2Br_2 is polar nonpolar cannot be determined The number of significant figures in 0.000340056000 is 4 6 9 12 13 To make ZnS by completely reacting 8.0 g of sulfur, the number of g of Zn is approximately 16 g 12 g 8 g 4 g A solution of A1(NO_3)_3 has [NO_3^-"] = 0.15 M. The [A1(NO_3)_3] is? 0.15 M 0.45 M 0.05 M cannot be determined

Explanation / Answer

1) Electron configuration of K+ is

1s^2 = 2 paired electron
2s^2,=2 paired electron
2p^6,= 2 paired electron
3s^2, =2 paired electron
3p^6 =2 paired electron
4s^0= 0 UNpaired electron

Correct option is a.

2) c

3) d

4) Cr usually has 24 electrons, so Cr 3+ would have 21 electrons.

First, you write the electron configuration of Chromium
1s2
2s2 2p6
3s2 3p6 3d5
4s1

Correct option is b.

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