GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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phosphorus
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oxygen
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beryllium
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rubidium
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Detailed explanation-1: -Answer: Phosphorus is a neutral element that belongs to Group 15A. The valence electrons in the phosphorus atom are five. These can be found at the atom’s third energy level.
Detailed explanation-2: -Elements having 5 valence electrons are placed in Group 15. The elements of group 15 are nitrogen, phosphorus, arsenic and antimony.
Detailed explanation-3: -Answer and Explanation: There are 5 valence electrons in phosphorus. Phosphorus is a main group element as indicated by the ‘A’ in its family number VA. The ‘V’ is the Roman numeral 5.
Detailed explanation-4: -Phosphorus is in group 15/VA. Based on its group number, phosphorus has 5 valence electrons, as do all of the elements in that group. Another way we can answer this question is to write the electron configuration for a neutral phosphorus atom, which would have 15 electrons: 1s22s22p63s23p3 .