5. Which of the following electron configurations could represent the electrons of an alkaline earth metal?
a. 1s22s22p63s23p64s23dº
b. 1s22s22p63s23p
C. 1s 2s22p?
d. 1s²2s22p63s?

Which of the following pairs of elements belong to the same groupa. h and he b. li and bec. c and pb d. ga and ge

In a chemical reaction at equilibrium, the rate of the forward reaction the rate of the reverse reaction. if the rate of the forward reaction more products are formed.

Count the number of each type of atom in the equation below, and then balance the equation. write in the numbers of atoms and coefficients. add a 1 if there should be no coefficient. cs2(l) + o2(g) → co2(g) + so2(g) c [ ] s [ ] o > c [ ] s [ ] o [ ] cs2(l) + [ ] o2(g) > [ ] co2(g) + [ ] so2(g)