Question

Fill in the blanks
Was The first calculating
Machine​

Answer 1

Answer:

Bt where is the Blank...

The law that the properties of the elements are periodic functions of their atomic numbers. Also called Mendeleev's law. (originally) the statement that the chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights...

Answer 2

Answer:

abascus

Explanation:

abacuses

Abacus, plural abaci or abacuses, calculating device, probably of Babylonian origin, that was long important in commerce. It is the ancestor of the modern calculating machine and computer.