Which of the following most likely explains why the chemical symbol for calcium is ca?

the symbol c was already used for carbon.
the element is named after the latin word for calcium.
the symbol was assigned by modern alchemists.
calcium is made of more than one type of atom.

Three alkali metals in group 1 are a. calcium, strontium, barium b. boron, aluminum, gallium c. sodium, potassium, rubidium d. fluorine, iodine, chlorine

What is the percentage of hydrogen in nitrogen trihydride

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.