a single atom of an element had 21 neutrons, and 20 electrons, and 20 protons which element is it? K. Zr. Ca. Sc

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An element has an atomic number of 79. The number of protons and elections in a neutral atom of the element are ... ? A. 197 protons and 79 electrons B. 79 protons and 0 electrons C. 79 protons and 79 electrons D. 79 protons and 197 electrons

Indicate the number of significant figures in the measured number 5.80 A. 0 B. 2 C. 3

How was the work of Newlands similar to that of Mendeleev on the periodic table? 1. They both arranged the elements in order of increasing atomic mass. 2. They both arranged elements that had similar properties into groups. 3.

People can become a part of a When a person becomes part of an electrical that person can be shocked

You determine the volume of your plastic bag (simulated human stomach) is 1.05 L. How many grams of NaHCO3 (s) are required to fill this container given a 70.

If 3.00 g of limestone reacted, what mass of calcium chloride would be produced?

Which four quantities a, b, c and d are required to balance the equation ... aMgO (s) + bHCl (aq) = = > cMgCl2 (aq) + dH2O (l)

Find the number of moles of water that can be formed if you have 134 mol of hydrogen gas and 62 mol of oxygen gas

The amount of kinetic energy an object has depends on its. motion position gravity height