Symbol-atomic number-mass number- Ca. 20. (blank)

#neutrons-#protons-#electrons-
(blank) 20. 18

atom or ion (include charge)
+2 Cation

-isotope or atom
isotope

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j

The force it would take to accelerate an 900-kg car at the rate of 6m/s2

What will happen in a hybrid vehicle if current flow becomes too high due to a short?