Answer:
one valence electron
Lithium has a single electron in the second principal energy level and so we say that lithium has one valence electron. Beryllium has two valence electrons.
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A. homogeneous
b. homogeneous
c. homogeneous.
d. <span>heterogenous
e. heterogeneous
f. heterogeneous</span>
The answer is 123
Brainliest??
Answer:
C.)Air is made up of atoms of one elements
The answer should be c because of the answer
