Which atoms have the same number of neutrons?

1) H-1 and He-3

2) H-2 and He-3

3) H-3 and He-3

4) H-3 and He-4

Is an element that is soft and easy to cut cleanly with a knife likely to be a metal or a nonmetal?

The men's world record for running a mile outdoors (as of 1999) is 3 min 43.13 s. At this rate, how long would it take to run a 2 km race (1 mi = 1609 m) ?

Describe how the periodic table of elements is organized

The matter that travels through a wave is called the what of a wave?

Which of the following best explains why you put KI and Pb (NO3) 2 into two separate test tubes before mixing them?

Two skydivers jump out of a plane. As the skydivers are in free fall, the potential energy they possessed at the airplane door Is being converted to kinetic energy True False

What part of an atom has no relative mass

A scientist studies the DNA of three different species. The DNA from species A is more similar to DNA from species B than DNA from species C. Which species are probably the most closely related? Explain your answer.

Gamma rays are waves of energy that have no charge. true false

Describe what a polar covalent bond is and name a common compound that has a polar covalent bond holding it together