Alpha and beta particles are similar because they both:
have the same mass
have the same charge
are physical particles of matter
have the same penetration abilities

They are both physical particles of matter

Explanation:

Alpha, beta particles and gamma rays are types of radiations given off by an unstable or radioactive isotope. Alpha particles are made of helium, and do not have electrons. Beta particles are electrons. Alpha particles are positively charged whereas beta particles are negatively charged.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: