Which 2 elements make up more than 80% of the atoms found in the Earth's crust

How many electrons would a neutral atom of nitrogen need to gain in order to have a full valence electrons shell

UCSON 4. Which of the following is used to measure the amount of electrons that flow through a line or circuit?

What is the pressure inside a tank when it contains 87.3 moles of Helium if it holds 52.0 miles at 9.63 atm

Ionization energy is the minimum energy required to remove an electron from an atom in its ground state. It depends on the position of the elements in periodic table. Which of these elements has highest ionization energy? A) B B) C C) F D) Ne

A mixture of NaBrO 3, NaBrO3, NaHCO 3, NaHCO3, Na 2 CO 3, Na2CO3, and NaBr NaBr was heated, producing H 2 O, H2O, CO 2, CO2, and O 2 O2 gases by the following equations.

A scientist observes the boundary between two tectonic plates for a decade and finds that no new volcanoes have formed over the course of her investigation. Does this result support the theory of plate tectonics? Why or why not?

Why is it incorrect to balance a chemical equation by changing the subscripts?

A solution of CuSO4 is labelled 0.01 M. How much CuSO4 in grams, must be used to make 1 liter of solution? A) 1.120 g B) 1.595 g C) 1.6 g D) 15.0 g

Rank the following elements according to their ionization energy: tin krypton antimony arsenic

Water (3030 g) is heated until it just begins to boil. If the water absorbs 5.49*105 J of heat in the process, what was the initial temperature of the water?