Can anyone help me solve these questions? On A, I tried the equation T=2pi(sqrt(L/g)), but my answer was wrong. Any help would be very appreciated!

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

Tall pacific coast redwood trees can reach heights of about 100 m. if air drag is negligibly small, how fast is a sequola cone moving when it reaches the ground f it dropped from the top of a 100 m tree?

The air that we breath is made mostly of which gaseous molecule