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Question 1

what is the name of the centre of the atom?

Answer 1

Nucleus

Question 2

which sub-atomic particle has a positive charge?

Answer 2

protons

Question 3

which particle has the smallest mass?

A. Electron
B. Neutron
C. Proton

Answer 3

A. Electron

Question 4

what is the electronic structure of neon?

Answer 4

2 , 8

Question 5

Correctly identify the stage in development of the atomic model from this description: A ball of positive charge with electrons embedded in it.

A. Daltons atoms
B. Plum Pudding model
C. Nucleus of atoms discovered
D. Neutrons discovered

Answer 5

B. Plum Pudding model

Question 6

The nucleus of a neon atom has a charge. What is this charge?

Answer 6

positive

Question 7

How many different elements are in the formula AgNO3?

Answer 7

3

Question 8

what is the correct definition of an isotope?

A. Atoms with the same number of protons but different number of neutrons
B. Atoms with the same number of neutrons but different number of protons
C. Atoms with the same number protons but different number of electrons
D. Atoms with the same number of neutrons but different number of electrons

Answer 8

A. Atoms with the same number of protons but different number of neutrons

Question 9

what is the relative mass of a neutron?

Answer 9

1

Question 10

The mass number of an atoms is the number of :

A. Electrons
B. Neutrons
C. Protons
D. The sum of neutrons and protons

Answer 10

D. The sum of neutrons and protons

Question 11

what is an element?

Answer 11

An element is a substance made of only one kind of atom that cannot be broken down into simpler substances.

Question 12

what is a compound?

Answer 12

A compound is a substance made up of two or more different elements that are chemically bonded together.

Question 13

what is a mixture?

Answer 13

A mixture is a combination of two or more substances that are physically combined but not chemically bonded, meaning they can be separated.

Question 14

what do elements in the same group of the periodic table have in common?

Answer 14

Elements in the same group have the same number number of electrons in their outermost shell, which gives them similar chemical properties.

Question 15

What did J.J Thomson discover in 1897 that changed the understanding of the atom?

Answer 15

The electron

Question 16

Which model of the atoms did J.J Thomson propose after his discovery?

Answer 16

The Plum Pudding model

Question 17

What was Ernest Rutherford’s key experiment that led to the discovery of the nucleus?

Answer 17

The Gold foil Experiment

Question 18

Which scientist’s work led to the discovery of the neutron?

Answer 18

James Chadwick

Question 19

Who is credited with creating the first widely accepted version of the Periodic Table, and how did he arrange the elements?

Answer 19

Dmitri Mendeleev is credited with creating the first widely accepted version of the periodic table. He arranged the elements in order of increasing atomic mass and left gaps for undiscovered elements, predicting their properties

Question 20

How are elements arranged in the modern Periodic Table?

Answer 20

Elements are arranged in order of increasing atomic number