I can't find the atom that matches this electron configuration. 1s^2 2s^2 2p^6 3s^2 3p^3 Can someone please help me?

Nitrogen (N)
Oxygen (O)
Phosphorus (P)
Sulfur (S)

Consider the reaction: n2(g) + o2(g) ⇄ 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

4. a 20-kg child is tossed up into the air by her parent. the child is 2 meters off the ground traveling 5 m/s. circle one: ke / gpe / both show your work for finding the values of each type of energy the object has: