Which element has 3 valence electrons in the 4d sublevel? a. v b. nb c. cu d. tl
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Ответ:
Ответ:
The correct answer is Option B.
Explanation:
Valence electrons are defined as the electrons which are present in outermost shell of an atom. This is determined by the electronic configuration of an element.
For the given options:
Option A: Vanadium (V)
The atomic number of this atom is 23 and number of electrons that are present are 23. The electronic configuration of vanadium is:
This element does not have 3 electrons in 4d-subshell.
Option B: Niobium (Nb)
The atomic number of this atom is 41 and number of electrons that are present are 41. The electronic configuration of niobium is:
This element have 3 electrons in 4d-subshell.
Option C: Copper (Cu)
The atomic number of this atom is 29 and number of electrons that are present are 29. The electronic configuration of copper is:
This element does not have 3 electrons in 4d-subshell.
Option D: Thallium (Tl)
The atomic number of this atom is 81 and number of electrons that are present are 81. The electronic configuration of thallium is:
This element does not have 3 electrons in 4d-subshell.
Hence, the correct answer is Option B.
Ответ:
C) to show that atoms are conserved in chemical reactions
Explanation: