Looking at the Bohr models of atoms offer an explanation as to WHY the atomic size changes as it does for both periods and groups.

Periods:

Groups:

If each fission reaction in a nuclear reactor emits three neutrons, how many neutrons are produced from three fission reactions? one three six nine

N an exothermic reaction, what is true of the enthalpy? A. It has increased. B. It has decreased. C. It has remained unchanged. D. It has, at minimum, doubled.

When placed in a 100-mL square box, a substance has a spherical shape and has a volume of 50 mL. When placed in a 100-mL circular tube, that same substance has a spherical shape and a 50-mL volume. In what phase or state was the substance?

In the chemical formula 3NO2 the number 3 is a

What is the most important role that water plays for living organisms A: All organisms need water to stay clean B: All organisms need water as an energy source C: All organisms need water to transport chemicals into their cells D: All organisms live

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.