Multiple Choice
How many valence electrons does tellurium (Te) have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many valence electrons are present in the outermost shell of a neutral atom with 15 electrons?
A
3
B
7
C
8
D
5
Verified step by step guidance1
Identify the element by its atomic number, which is equal to the number of electrons in a neutral atom. Here, the atom has 15 electrons, so its atomic number is 15.
Determine the electron configuration of the atom by filling the electron shells in order of increasing energy levels. The order is 1s, 2s, 2p, 3s, 3p, etc.
Write the electron configuration for 15 electrons: 1s\^2 2s\^2 2p\^6 3s\^2 3p\^3.
Identify the outermost shell (valence shell), which is the highest principal quantum number (n). For this atom, the outermost shell is the third shell (3s and 3p orbitals).
Count the electrons in the outermost shell: 3s\^2 + 3p\^3 = 5 valence electrons.
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