Which element does the electron configuration 1s2s2p2 represent?

1. Copper (__) is an element on the periodic table. CU (both letters capitalized) Cu (first letter capitalized) cU (second letter capitalized) cu (both letters lowercase)

Sam's father bought Sam a goldfish and a fish bowl. What must Sam put in the fish bowl so that the goldfish will survive? A. water B. plants C. sand D. air

At home, Helena is cooking with butter and lard. While the fats sit on the counter, she notices that the butter begins to melt, but the lard doesn't. Based on what she knows about fats, which product most likely contains the most hydrogen atoms

He second-order decomposition of hi has a rate constant of 1.80 x 10-3 m-1s-1. how much hi remains after 27.3 s if the initial concentration of hi is 4.78 m? a. 4.55 m b. 0.258 m c. 3.87 m d. 2.20 m e. 2.39 m

The Bohr atomic model suggests that: The atom is made mostly of space. Electrons randomly orbit the nucleus. Protons and neutrons occupy energy shells. Gamma rays can can be used to split atoms.

Which of the following quantum number combinations is not allowed in an atom? A. n = 2, l = 1, mr = - 1 B. n = 1, l = 1, m = 0 C. n = 8, l = 5, m = - 4 D. n = 6, l = 3, m = 2

13. Adding thermal energy to a gas at constant pressure will cause

A 3 ml volume of a solution containing an unknown concentration of hcl is added to 7 ml of water. it is then determined that the concentration of the hcl in the diluted solution is 630 mm. what was the concentration of hcl in the original solution?

How do you find the ph of water

How many total electron will fit in the 1st energy level