Which of the answer choices best describes why the results of Ernest Rutherford's gold foil experiment led him to propose the concept of a nucleus?

Mass number of barom aton

A particular atom of an element has a mass number of 15. There are 10 electrons in the - 3 ion of the atom. Identify the element, using the correct element symbol, the number of protons and number of neutrons in this atom.

12 thousand in scientific notation

1. Where are people in the shrimp food chain? A. Close to the very bottom B. About in the middle C. Close to the top D. At the very top

The noble-gas notation for tin (Sn) will contain the symbol

How to find the number of neutrons in an atom

A balanced chemical equation indicates both the number of particles of reactants and products and the number of a. orbits. c. nuclei. b. electrons. d. moles

To squeeze a gas into a smaller space

Why does soda fizz when you poor it into a cup?

Which of the following does NOT describe acute exposure to hazardous materials? A. Determination of exposure is almost always after the fact. B. Long time period between exposure to an agent and the onset of symptoms. C.