Which of the following characteristics indicates that an atom is unstable? A. A full valence shell
B. Forming very strong bonds
C. Existing by itself
D. Low electronegativity

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

If 16.00g of hydrogen gas reacts with 126.73g of oxygen, how many grams of water are yielded? (both reactants are completely consumed in the reaction.)