An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element?

A. 10

B. 20

C. 30

D. 0

E. 200

Identify a way to increase the concentration of a gas substance. a) squeeze it into a bigger volume b) squeeze it into a smaller volume c) increase the temperature

Jill formed ionic compounds using the index cards she combined sodium and zinc to form the compound na2zn is this a possible a ionic compound and why

The number of orbits iron / Fe has is? 4 or 14

The theoretical yield of a reaction is the amount of product obtained if the limiting reactant is completely converted to product. Consider the reaction: N2 (g) + 3 H2 (g) → 2 NH3 (g) If 13.90 g N2 is mixed with 6.

The element phosporus is located to the right of the element magnesium along the same period in the periodic table. Which best describes the relationship of the elements? Magnesium has a larger atomic number. Phosphorus has a larger atomic mass.

A light-year measures the distance a light beam can travel in one year. One light-year is equal to 9 500 000 000 000 kilometers.

The first ionization energy, e, of a potassium atom is 0.696 aj. what is the wavelength of light, in nm, that is just sufficient to ionize a potassium atom? values for constants can be found here.

A gene is a to a chromosome as (A) a pea is to a pod (B) a front to a back (C) a bike is to a car (D) a building is to a window

How are you enjoying this weather? (i need good reasons}

In today's experiment, some lab students let their chromatograms elute slightly longer than others. If one student's solvent front traveled to 9.80 cm, and another student's solvent front traveled 8.