Hydrogen gas is a (n) : atom of hydrogen, molecule of hydrogen, OR different element from hydrogen?

It seems that the earth is the only planet that can support life as we know it. Which of these is a characteristic of the earth that allows it to support life?

Hat is the structural formula for butene

Can an isotope also be an ion?

Calculate the energy of a photon of radiation with a frequency of 8.5*10^14

Which factors of Earth's position would contribute to long-term climate change? its elliptical orbit and the tilt on its axis its distance from other planets and the tilt on its axis the tilt on its axis and its distance from the moon its distance

What element is represented by the following electron configuration: 1s22s22p63s23p64s23d4 Question 2 options: Cr Ca Ge Ar

He substance, cocl2, is useful as a humidity indicator because it changes from pale blue to pink as it gains water from moist air. What is its name?

The weighted average atomic mass of an element depends upon the a. relative abundance of protons in the element b. mass and relative abundance of each isotope of that element c. mass and relative abundance of each neutron of that element d.

What part of an atom do we change for isotopes

The Safe Drinking Water Act (SDWA) sets a limit for mercury-a toxin to the central nervous system-at 0.002 mg/L. Water suppliers must periodically test their water to ensure that mercury levels do not exceed 0.002 mg/L.