Interpretation:
Outermost subshell for bromine, Br is to be named.
Concept introduction:
A periodic table can be divided into four zones, s block, p block, d block and f block. The element belonging to a particular block has the outermost electron in that particular subshell. For example in case of s block elements, the outermost electrons will occupy s subshell. Elements in p block will have its outermost electrons in p subshell.
Answer to Problem 7E
Outermost subshell for bromine, Br is ‘4p’.
Explanation of Solution
Given information:
Bromine has an
The atomic number of bromine is 35. It is located in p block of periodic table. Its position is in group 17 and period 4. In a neutral atom of bromine there are 35 electrons which are located in shells, n = 1, n=2, n=3 and n=4.
The electronic configuration of bromine is 1s2 2s2 2p63s2 3p6 3d104s24p5
It has 7 valence electrons which are located in fourth shell; that is in n = 4.
It has 4s and 4p subshells with 2 and 5 electrons respectively. Hence the outermost subshell of bromine is 4p.
By knowing the position of an element on a periodic table, one can predict the arrangement of electrons. The periodic table provides the information needed to write the electronic configurations.
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