0306-W037(H) 7.3 FINDING THE NUCLEUS

A scientidt concluded that  most of an atoms mass and positive charge is concentrated in a small area in the center, the nucleus. Research showed that the positive charge of the nucleus was made out of _______ (an atomic particle with one positie charge).​

The atom has 24 atomic mass and 14 neutrons. How many electron does it have.

• 24

• 10

• 14

• 12

At what year was Ernest Rutherford moved to England to study under Thomson?

• 1895

• 1595

• 1785

• 1995

What is the atomic number of this nucleus?

• 1
• 3
• 4
• 7

.................... is the area around the nucleus where the probability of finding the electron is greater

• Electron cloud

• Nucleus

In our study about atomic theories, what do philosophers and scientists used to describe their thoughts about the atom so that people can understand?

• electromagnetic spectrum

• model

• manuscript

• manual

What is the neutron number of the sodium atom?

• 23

• 12

• 11

• 22

What is the mass number and atomic number ?

• Mass number = 7, atomic number = 14

• Mass number = 14, atomic number = 7

He proposed a model of atom which is known as Plum Pudding Model where the atom consists of a sphere of positive charge with negatively charged electron embedded in it.

• Democritus

• John Dalton

• J.J. Thomson

• Ernest Rutherford

In the Plum Pudding model of the atom, where is most of the mass of the atom?

• in the electrons

• In the matter between the electrons

• In the nucleus

• In the protons