Explain how cobalt-60 and cobalt - 59 can be the same element but have different mass numbers

Salt are know as atom elements covalent compound ionic compound

How many chromosomes does a person with down syndrome have?

Objects do not need to be touching in order to transfer charge true or false

An allergy pill has the following information on its label: This product will reduce the effects of hay fever. This product has not been evaluated by the Food and Drug Administration: This product contains all-natural ingredients.

Which of the following elements is the most metallic? a. K b. KR c. FE d. CU

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

How many electrons should be shown in the lewis symbol for hydrogen?