An element's atomic number is 81. How many protons would an atom of this element have? protons

A neutral atom possesses an number of 13 and an atomic mass of 27. three electrons are lost. from what region of the atom are they lost? A. Outside the atom B. Outside the nucleus C. inside the nucleus D. both inside and outside the nucleus

Which unit can be used to express solution concentration? 1) J/mol 2) L/mol 3) mol/L 4) mol/s

Lithium and nitrogen react to produce lithium nitride: 6 l i (s) + n 2 (g) → 2 l i 3 n (s). how many moles of lithium nitride are produced when 0.550 mol of lithium

Why does a blimp flying around the super bowl have potential energy

If you have a string of lights and one light goes out but the others stay lit, which type of circuit do you have? A. short B. parallel C. series D. broken

In order for a solute to dissolve in a solvent, what must be true?

Radiocarbon dating can be used to determine the age of A a sample less than a million years old B a sample less than 100,000 years old C a sample less than 50,000 years old - D a sample less than five million years old

How many electrons in an atom can have each of the following quantum number or sublevel designations? (a) 4p (b) n = 3, l = 1, m1 = + 1 (c) n = 5, l = 3

Could the two aqueous solutions be identified through a visual inspection? Explain.

The reaction, C2H6) (l) + 3) 2 (g) produces 2CO2 (g) + 3H2) (g), is the combustion of ethanol. What occurs as the reaction proceeds.