how many electrons are presentin an atom if indium whose atomic # is 49 and whose mass # is 115 = ___electrons

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how many electrons are presentin an atom if indium whose atomic # is 49 and whose mass # is 115 = ___electrons

2007-09-27 14:33:29 · 3 answers · asked by SoccerGirl 1 in Science & Mathematics ➔ Chemistry

3 answers

If it is a neutral atom, then the # electrons = # protons, which equals the atomic number.
49 electrons

2007-09-27 14:36:59 · answer #1 · answered by Marvin 4 · 0⤊ 0⤋

No. of Electrons in Indium (In) = 49 (equal to Atomic No.of Protons).
They 'reside' in 5 Energy levels (or Shells).
'K' Shell = 2 Electrons,
'L' Shell = 8,
'M' Shell = 18,
'N' Shell = 18,
'O' Shell = 3

2007-09-27 21:42:05 · answer #2 · answered by Norrie 7 · 0⤊ 0⤋

49 electrons

2007-09-27 21:38:18 · answer #3 · answered by steve_geo1 7 · 0⤊ 0⤋