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Q: Which elemnts has 3 valence electrons in the 4d sublevel?
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How would you justify the presence of 18 elements in the fifth of period of periodic table?

In the fifth period of the periodic table, the atoms of the elements in the first two groups are adding 1 and 2 electrons, respectively, to their highest energy 5s sublevel. Starting in group 3/IIIB and going through group 12/IIB, the atoms of those elements are adding electrons to their highest energy 4d sublevel. Since the d sublevel can contain a maxium of 10 electrons, there are 10 elements whose atoms are filling the 4d sublevel. Once the 4d sublevel is filled, the next higher energy sublevel is the 5p sublevel. Starting with the group 13/IIIA elements, the 5p sublevel is being filled. Since a p sublevel can contain a maximum of 6 electrons, there are six elements whose atoms are filling the 5p sublevel. 5s sublevel filling: 2 elements 4d sublevel filling: 10 elements 5p sublevel filling: 6 elements --------------------------------------- Total: 18 elements For a printable periodic table that includes electron configurations, go to the following link: http://www.nist.gov/pml/data/periodic.cfm


How many orbitals are in 4d sublevel?

7 Orbitals


What is the orbital of the element yttrium?

The valence electrons fill in 4d orbital The electron configuration of yttrium is [Kr]4d15s2.


How many electrons can be acomodated in a 5d orbital?

The d sublevel always contains 5 orbitals. Therefore the d sublevel can accommodate 10 electrons just the same as 3d and 4d orbitals. Each of the 5 separate d orbitals can only contain two electrons.


How many electrons are in ruthenium?

Ruthenium has a electron configuration of *[Kr]4d^7 5s^1. It has only one valence electron. Ruthenium is a rare transition metal that belongs with the platinum group on the periodic table.


What element has three 4d electrons?

Niobium (Nb) Because three 4d electrons = 3d^3


What is the symbol of the first element to have an electron in the 4d sublevel in its ground state?

The element is Yttrium, with the symbol Y


What electron sublevel starts to fill after completion of the 4d sublevel?

It goes 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p... it goes according to the principal quantum number, l. the subshells (or energy levels) have corresponding letters... 0th sublevel: s 1st sublevel: p 2nd sublevel: d 3rd sublevel: f 4th: g 5th: h 6th: i etc. usually, we dont use energy levels above the f subshell.


How many lone pairs are on the central atom of bromine trifluoride?

there is only 1 lone pair present in BrF5 there are 7 electrons in Br valence shell from which 5 electrons went to make bond with F, while the remaining two makes a lone pair. and thus anly 1 lone pair exist in BrF5


What is the number of 4d electrons in Mo?

5


How many 4d electrons are in Iodine?

27


How many electrons is in the 4d subshell in the ground state of the atom xenon?

10 electrons.