11. How many elements are in the second period, or row, of the periodic table

a. 1

b. 2

C. 8

d. 18

The star Rho1 Cancri is 57 light-years from the earth and has a mass 0.85 times that of our sun. A planet has been detected in a circular orbit around Rho1 Cancri with an orbital radius equal to 0.

Astronomy has emerged as a science in the past two hundred years. true false

In which of the following materials is the velocity of light greatest? A. Air B. Water C. Fused quartz D. Crown glass

What does a main sequence star become after it uses up its hydrogen in its core

True or false: atoms combine in different ways to make up all of the substances you encounter everyday

Describe one example of competiton of tropical dry forest

What is the center of a tornado called A. the eye B. The center C. The middle road D. The vortex

Is it legal in Florida for a math teacher forces the kids to do push ups?

Acceleration is best defined as the rate of change of blank of an object

Zirconium has an atomic number of 40. How many neutrons are there in an isotope of zirconium-92?