One isotope of nitrogen has 7 protons and 8 neutrons. which is the correct reference for this isotope? . a. nitrogen-1 . b. nitrogen-7 . c. nitrogen-8 . d. nitrogen-15 .

What substance has a mass of 9.5g and volume of 2.1cm^3

Sandy is building a small toy car. he wants to use a balloon to power the toy car. he fills a balloon with air and then attaches a straw to the balloon. he tapes the balloon-straw combination to the car and then releases the end of the balloon. the toy moves forward as the air from the balloon comes out the back of the straw. what can sandy do to make the toy car move faster? a) use less air in the balloon. b) blow up the balloon more. c) use a longer straw. d) use larger tires.

Astable atom that has a large nucleus most likely contains 1. more neutrons than protons. 2.more protons than neutrons. 3.equal numbers of protons and neutrons. 4.changing numbers of protons and neutrons.