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

Each pair of clay balls represents to planetesimals if each plane test molluscum pound of the same material and is separated by the same distance which pair experiences the greatest gravitational attraction

Electrons are extremely important to what area of technology? a) anti-aging research b) household product development c) electronics d) drug discovery

What is the mass of 8 moles of sodium atoms