Which of the following does not describe nor contain electrons? 1. a subatomic particle having a mass of 0.00055 u 2. a cathode ray 3. a subatomic particle having a charge of −1 4. a γ ray 5. a β particle

Cathode ray - a beam of electrons emitted from the cathode of a high-vacuum tube.

Beta particle - A beta particle, sometimes called beta ray is a high-energy, high-speed electron or positron emitted in the radioactive decay of an atomic nucleus.

It is a subatomic particle indeed with given mass and charge.

So the answer is 4. a Gamma ray
Gamma ray - Gamma rays (also called gamma radiation) are penetrating electromagnetic radiation of a kind arising from the radioactive decay of atomic nuclei. It consists of photons in the highest observed range of photon energy.

A.(nh4)(2co3)is the correct answer 

c. electrical charges of ionic bonds.

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