What happens to the mass number of a nucleus that emits an alpha particle?

Suppose you are trying to find the identity of an unknown pure substance. The valence electrons of the substance's atoms feel an effective nuclear charge of + 1.

a 2.17 gm sample barium reacted completely with water what is the equation for the reaction how many milliliters of dry H2 evoled at 21degree celcius and 748mm of Hg? solution

Some chemical reactions take a very long time to go to completion or cannot be directly measured. Which law allows one to use two or more thermochemical equations to calculate the heat of a reaction indirectly?

Based on their number of valence electrons, which group of elements will gain two electrons by bonding with other atoms? Question 1 options: F, Cl, Br, I, At N, P, As, Sb, Bi O, S, Se, Te, Po Be, Mg, Ca, Sr, Ba

An aqueous solution is 3.00% by mass dextrose (C6H12O6) in water. If the density of the solution is 1.0097 g/mL, calculate the molarity of dextrose in the solution.

How are revolution and year related

Read the scientific question below. "Does sunlight make plants live?" What is a likely hypothesis for the question?

A chemist is using a solution of HNO3 that has a pH of 3.75. What is [H+] for the solution?

What is the oxidation number for CO2

Which is a property of acids in aqueous solutions?