#1
What is the electron configuration of carbon?
1s2 2s2 2p2
ExplanationCarbon has 6 electrons, with 2 in the 1s sublevel, 2 in the 2s sublevel, and 2 in the 2p sublevel.
#2
Which sublevel has the highest energy?
3d
ExplanationThe 3d sublevel has higher energy than the 2p and 3s sublevels.
#3
What is the electron configuration of a phosphorus atom?
1s2 2s2 2p6 3s2 3p4
ExplanationPhosphorus has 15 electrons, with 5 in the 3p sublevel.
#4
Which element has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p3?
Iodine (I)
ExplanationIodine has 53 electrons and is in the fifth period.
#5
What is the electron configuration of a sodium ion (Na^+)?
1s2 2s2 2p6
ExplanationNa^+ has lost one electron, resulting in a filled 2s and 2p sublevels.
#6
Which of the following has the highest first ionization energy?
Ga (Gallium)
ExplanationGallium has the highest first ionization energy among the options.
#7
How many electrons can the d sublevel hold?
10
ExplanationThe d sublevel can hold a maximum of 10 electrons.
#8
What is the electron configuration of the ion Ca^2+?
1s2 2s2 2p6 3s2 3p6
ExplanationCa^2+ has lost 2 electrons, resulting in a filled 3s and 3p sublevels.
#9
How many unpaired electrons are there in an atom with the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d7?
1
ExplanationThere is one unpaired electron in the 3d sublevel.
#10
What is the electron configuration of the ion Fe^3+?
1s2 2s2 2p6 3s2 3p6 3d5
ExplanationFe^3+ has lost 3 electrons, resulting in a partially filled 3d sublevel.
#11
How many electrons can the f sublevel hold?
14
ExplanationThe f sublevel can hold a maximum of 14 electrons.
#12
What is the electron configuration of the ion Ag^+?
1s2 2s2 2p6 3s2 3p6 3d9
ExplanationAg^+ has lost one electron from the 4s sublevel.
#13
What is the electron configuration of a chromium atom?
1s2 2s2 2p6 3s2 3p6 4s2 3d5
ExplanationChromium has a partially filled 3d sublevel, with one electron in each orbital.
#14
Which element has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s1 3d10?
Zinc (Zn)
ExplanationZinc has a filled 3d sublevel and is in the 4th period.
#15
Which element has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d9?
Cobalt (Co)
ExplanationCobalt has a partially filled 3d sublevel with 9 electrons.
#16
Which element has the electron configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s1?
Copper (Cu)
ExplanationCopper has a partially filled 4s sublevel with 1 electron.
#17
Which element has the electron configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1?
Sr (Strontium)
ExplanationStrontium has the electron configuration given and is in the fifth period.