In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom? a- it showed that atoms combine in different proportions. b-it showed that atoms can be divided into smaller parts.c- it showed that all atoms of the same element are similar. d-it showed that individual atoms could be destroyed. it showed that all atoms contain electrons.

The answer is: B-It showed that atoms can be divided into smaller parts.

It showed that all atoms contain electrons.

Tomson concluded that atoms are divisible and that the corpuscles are their building blocks (atoms are made up of smaller particles).

J. J. Thomson discovered the electron in 1897.

His "plum pudding" model (1904) suggested: the electrons are embedded in the positive charge.

With this model, he abandoned his earlier hypothesis (the atom was composed of immaterial vortices).  

They have the same number of protons

They have the same number of neutrons

Explanation:

Considering Be and Be2+, two electrons were lost from the atom for the ion to be formed. The number of protons and the number of neutrons remain the same. Hence the atom and its ion share a similarity in the number of protons and neutrons present in both the atom and ion being exactly the same. This is a similarity between Be2+ and Be- the both possess the same number of neutrons and the both also posses the same number of protons.