ELECTRONS AND THE PERIODIC TABLE

Arsenic does not have any valence electrons in the 3d orbital because its 3d orbital is completely filled. it only contains enough electrons to fill the 2s orbital. it is an inert substance that is not reactive. all of its valence electrons are in the 3p orbital.

its 3d orbital is completely filled.

How many valence electrons does lithium (Li) have available for bonding? 1 2 3 4

1

Which is the electronic configuration for oxygen? 1s2 2s2 2p1 1s2 2s2 2p3 1s2 2s2 2p4 1s2 2s2 2p6

1s2 2s2 2p4

The electron configuration of nitrogen (N) is 1s22s22p3 1s22s22p4 1s22s22p5 1s22s22p6

1s22s22p3

What is the number of valence electrons in cadmium (Cd)? 1 2 10 12

2

The noble-gas notation for tin (Sn) will contain the symbol [Ar]. [Kr]. [Xe]. [Rn].

[Kr]

Which is the noble gas notation for chlorine? [Ne] 4s2 4p5 [Ne] 3s2 3p5 [Ne] 3s2 3p3 [Ne] 3p2 3p5

[Ne] 3s2 3p5

Which is the electron configuration for nobelium (No)? [Rn]7s25f14 [Rn]7s25f7 [Ne]3s23p7 [Xe]6s25d1

[Rn]7s25f14

Which is the noble-gas notation for lead (Pb)? [Rn]6s24f145d106p2 [Rn]6s25d106p2 [Xe]6s24f145d106p2 [Xe]6s25d106p2

[Xe]6s24f145d106p2

Hydrogen reacts with an element to form a compound. Which element would have the most electrons available to react with hydrogen? oxygen chlorine neon nitrogen

chlorine

In which block of the periodic table is chromium (Cr) found? s block d block p block f block

d block

In which block of the periodic table is uranium (U) found? s block d block p block f block

f block

Which of the following elements has the fewest valence electrons? beryllium boron carbon lithium

lithium

Which of these elements has an electron configuration of [Kr]5s2? barium calcium rubidium strontium

strontium

It is easier to determine the electron configurations for the p-block elements in periods 1, 2, and 3 than to determine the electron configurations for the rest of the p-block elements in the periodic table because they have a larger number of core electrons. their electrons are assigned to s and p orbitals only. their electrons are placed in a higher number of orbitals. they have more valence electrons available for bonding.

their electrons are assigned to s and p orbitals only.