How were the atomic models developed given that no one had seen an atom

On a Periodic Table, an element classified as a semimetal (metalloid) can be found in ... A. Period 6, Group 15 B. Period 2, Group 14 C. Period 3, Group 16 D. Period 4, Group 15

How to find the formula for sodium phosphate?

Which is not one of the eight most common elements in Earth's continental crust? oxygen aluminum silicon carbon

What is the percent by mass of 5.0 g of nacl mixed with 80. g of water?

How many grams of glucose are needed to prepare 400 ml of a 2.0% glucose solution?

What scientist do that basis for their investigation

A closed flask contains water at 70 deg C. The total pressure of the air-and-water-vapor mixture is 500.0 torr. What is the partial pressure (in torr) of the air in this flask? Use your book for the vapor pressure of water at this temperature.

What was the approximate overall change in the carbon dioxide content between 1900 and 1962?

What mass of nitrogen Dioxide, NO2, would be produced by the decomposition of 75.0g of copper (II) nitrate?

A tube that carries air from the larynx to the lungs is called