SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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31
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5
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15
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4
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Detailed explanation-1: -Therefore, the valence electron in a Phosphorus atom is 5.
Detailed explanation-2: -The highest-numbered shell is the third shell, which has 2 electrons in the 3s subshell and 3 electrons in the 3p subshell. That gives a total of 5 electrons, so neutral phosphorus atoms have 5 valence electrons.
Detailed explanation-3: -Elements having 5 valence electrons are placed in Group 15. The elements of group 15 are nitrogen, phosphorus, arsenic and antimony.
Detailed explanation-4: -Phosphorus is having 5 electrons in the valence shell. If it is written in orbital pattern (in higher level studies) it will be written as 2s2, 2p3. If phosphorus is using only electrons from p then the valence will be 3. If both the electrons from “s” as well as “p” are used the valence will be five.
Detailed explanation-5: -Therefore, the element in the fourth period of the periodic table which has five valence electrons is Arsenic. Note: The atomic radius, ionisation energy, and electronegativity of elements in the same period appear to follow a pattern.