Write the atomic number of the element with the following electronic configuration 1s2 2s2 2p6 3s2 3p6 3d7 4s2

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

How many lone pairs of electrons are on the central atom of no3- and what is the molecular shape? one, trigonal planar zero, trigonal pyramidal zero, trigonal planar one, tetrahedral one, trigonal pyramidal

Ablock of aluminum is dropped into a graduated cylinder with an initial volume of water at 75ml and the volumes rises to 90ml. if the block has a mass of 40.5 g what is its density ?