Which elements have two valence electrons?

A. Carbon

B. Sodium

C. Fluorine

D. Magnesium

D. Magnesium

Explanation:

Everything in the second group/family (Alkaline Earth Metals) has 2 valence electrons

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adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.