What is an element? Name three elemants.

2Li + __H₂0 = __LiOH+H₂ balance the equation

What relationship can be seen in an element's placement within a group and its electron configuration?

As you go down a family or group on the periodic table * the atoms become smaller and smaller. the elements become less reactive. the elements become more reactive. the atoms have more and more valence electrons.

you have one mole of the following atoms: carbon - 12, oxygen - 16, and uranium - 235. Which substance has more atoms?

Strontium has the atomic number of 38 and a mass number of 88 how many neutrons are in one atom of strontium A.) 50 B.) 38 C.) 88 D.) 126

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?