Balance this chemical equation. choose "blank" for the box if no other coefficient is needed. writing the symbol implies "1." hcl + zn → zncl2 + h2

Evaluate this exponential expression,8. (2 + 3)2 – 42

Which statement describes james chadwick’s discovery.

Choose all the answers that apply. fluorine (f) has an atomic number of 9 and an atomic weight of 18.99. fluorine has a. 9 protons b. 10 neutrons c. 18 electrons d. an atomic mass of 19 e. at least one isotope