what is the atomic number of the as yet undiscovered element in which the 8s and 8p electron energy levels fill?

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

Select the correct answer from each drop-down menu.describe what happens to a carbon-11 atom when it undergoes positron emission.the decay of a carbon-11 atom _1_, and this causes it to emit _2_.options for 1: > changes a neutron into a proton> changes a proton into a neutron> is hit with a neutron> reconfigures its protons and neutronsoptions for 2: > a negatively charged electron-sized particle> a positively charged election-sized particle> two atoms and several neutrons> two neutrons and two protons

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer