Match the scientist to his contribution to the atomic theory. match term definition j. j. thomson a) positively charged nucleus john dalton b) plum pudding model ernest rutherford c) atoms indivisible james chadwick d) discovery of neutrons

Answer is:

J.J. Thomson- B) Plum Pudding Model.

J. J. Thomson discovered the electron in 1897.  

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

John Dalton - C) Atoms indivisible.

Dalton stated that atom is matter that can not be divided

Ernest Rutherford - A) Positively charged nucleus.

According to Rutherford model of the atom:

1) Atoms have their charge concentrated in a very small nucleus.

2) Major space in an atom is empty.

3) Atoms nucleus is surrounded by negatively charged particles called electrons.  

4) An atom is electrically neutral.

James Chadwick - D) Discovery of neutrons.

James Chadwick was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.