Question 1

Which pair of charged particles has the lowest potential energy according to Coulomb's Law?

Accepted Answer

A particle with a +1 charge and a particle with a -1 charge separated by 100 pm

Question 2

Which element in the fourth period of the periodic table has five valence electrons?

Accepted Answer

As

Question 3

Arrange the following elements in order of increasing atomic radius: Ca, Rb, S, Si, Ge, F.

Accepted Answer

F \u003c S \u003c Si \u003c Ge \u003c Ca \u003c Rb

Question 4

Which element has the electron configuration $$[Ar] 4s^2$ 3d$$^{10}$$ 4p^6$?

Accepted Answer

Kr

Question 5

Which element in the third period has three valence electrons?

Accepted Answer

Al

Question 6

Choose the larger atom from each pair: Al or In.

Accepted Answer

In

Question 7

Write the electron configuration for $$O^{2-}.$$

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$

Question 8

Which element has the highest first ionization energy among Cl, S, K, and Na?

Accepted Answer

Cl

Question 9

Which element has the more negative (more exothermic) electron affinity: S or P?

Accepted Answer

S

Question 10

Arrange the following elements in order of decreasing metallic character: Sn, N, Si, P, Ge, Al.

Accepted Answer

Sn \u003e Ge \u003e Al \u003e Si \u003e P \u003e N

Question 11

Which element has the electron configuration $$[Kr] 5s^2$?

Accepted Answer

Sr

Question 12

Which element would you expect to have the most similar atomic radii, and why?

Accepted Answer

Sb and As, because they are in the same group

Question 13

Which element has the electron configuration $$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^1$$?

Accepted Answer

Al

Question 14

Which element has the highest metallic character among Sb, As, and Bi?

Accepted Answer

Bi

Question 15

Which element has the electron configuration $$[Ne] 3s^2$ 3p^6$?

Accepted Answer

Ar

Question 16

Which element has the electron configuration $$[Ar] 4s^2$ 3d^6$?

Accepted Answer

Fe

Question 17

Which element has the electron configuration $$[He] 2s^2$ 2p^3$?

Accepted Answer

N

Question 18

Which element has the electron configuration $$[Ar] 4s^1$?

Accepted Answer

K

Question 19

Which element has the electron configuration $$[Kr] 4d$$^{10}$$ 5s^2$ 5p^5$?

Accepted Answer

I

Question 20

Which element has the electron configuration $$[Ne] 3s^2$ 3p^4$?

Accepted Answer

S

Study Guidance for Periodic Properties and Electron Configurations

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