Pls answer. will give thanks ! 1. Potassium (K) is in row 2 of the periodic table. how many energy shells does one atom of Potassium have?

2. Carbon (C) is in column 14 of the periodic table. how many electrons are in the outermost energy shell of an atom of carbon?

3. Nickel (NI) has an atomic number of 28. how many protons are in the nucleus of one atom of nickel?

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

all eukaryotic cell have mitochondria : )