C3-4 Atomic Structure and Periodic Table

Question 1

Why is the relative mass of chlorine given as 35.5?

Accepted Answer

The average mass of each atom is 35.5, Chlorine has two common isotopes

Question 2

An atom has 6 electrons in its outer shell. It definitely...

Accepted Answer

is in group 6

Question 3

How many protons does this atom have?

Accepted Answer

5

Question 4

What is the correct electron configuration for Boron?

Accepted Answer

2,3

Question 5

Metals have more electrons in their outer shells than non-metals

Accepted Answer

False

Question 6

Why did Mendeleev change the order of some pairs of elements?

Accepted Answer

So that they would be in the correct groups

Question 7

Which of Daltons (1766-1834) theories about atoms turned out to be incorrect?

Accepted Answer

Atoms cannot be broken down into pieces

Question 8

What is the relative atomic mass of the sample below?

Accepted Answer

63.4

Question 9

Mendeleev arranged his periodic table by...

Accepted Answer

Increasing atomic weight, Putting similar elements in the same group

Question 10

Not a valid difference between Mendeleev's table and the modern periodic table.

Accepted Answer

The modern table doesn't have similar elements in groups

Question 11

The number of _______ determines which element an atom is

Accepted Answer

Protons

Question 12

Why does a neutral atom contain the same number of electrons as protons?

Accepted Answer

Because the positive and negative charges then cancel

Question 13

Which of these are isotopes of the same element?

Accepted Answer

J and Z

Question 14

How many neutrons does this atom have?

Accepted Answer

6

Question 15

What is the relative mass of a proton?

Accepted Answer

1

Question 16

Which of these statements could not be used to describe the mass number of an element

Accepted Answer

The number of neutrons in an atom

Question 17

What is different about these isotopes of Lithium?

Accepted Answer

Different numbers of neutrons, Different mass numbers

Question 18

What is the relative charge of a neutron?

Accepted Answer

0

Question 19

Which of these is not a sub-atomic particle

Accepted Answer

Moron

Question 20

Metals are always found on the ________ of the periodic table

Accepted Answer

Left

Question 21

Elements in the same group have...

Accepted Answer

The same number of electrons in the outer shell

Question 22

What is the mass number of this atom?

Accepted Answer

11

Question 23

What is the relative charge of an electron?

Accepted Answer

1-

Question 24

The mass of an atom is concentrated in the...

Accepted Answer

Nucleus

Question 25

Why did Mendeleev leave gaps on his periodic table?

Accepted Answer

For undiscovered elements, To be able to put similar elements in the same group

C3-4 Atomic Structure and Periodic Table

Questions 25

C3-4 Atomic Structure and Periodic Table

Questions 25