Copy of Year 9 atomic structure 2025-2026 (20/12/2025)

6

Complete the table and then copy the correct table into your notes.

Other Answer Choices:

1/2000

1

0

+1

-1

3

Hint, the number of protons must be equal to the number of electrons.

Other Answer Choices:

Proton

Neutron

electron

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6

This question is about the element beryllium.  
An atom of beryllium has a central ____________ that contains particles  called Protons and _____________ . 
Around these  particles there are ______________ orbiting in ___________ . 
An atom of beryllium has no charge because it contains equal numbers  of (positive) ____________ and  (_____________) electrons.  

Other Answer Choices:

shells

electrons

nucleus

neutrons

negative

protons

2

Beryllium forms a compound with the formula Be(OH)₂  

(i) How many different elements are there in Be(OH)₂? _______ 

(ii) What is the total number of atoms in the formula Be(OH)₂ ? _______ 

1

Note, you will have to use some of the numbers more than once.
The atomic number for this isotope of hydrogen is ______
The atomic mass for this isotope of hydrogen is ______  
Number of protons .______ ...............................................................  
Number of neutrons ______ ................................................................  
Number of electrons ______ ................................................................

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2

1

3

4

Complete the table.

Other Answer Choices:

0

-1

1

The atomic number of atom L is __________.

1

The mass number of atom L is __________.

1

3

Use information from the table to explain why atoms L and M are isotopes of the same element.
They both have ______ protons but L has ______ neutrons, whereas M has only 6_____________ Isotopes are atoms of an element that have the same number of protons but different numbers of neutrons.

Other Answer Choices:

neutrons

8

6

1

6

Hint: some answers can be reused and other answers may not be needed at all.

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79

81

46

44

35

8

Boron atoms have ____ protons and ____ electrons.
Boron occurs as two ____ .
Boron 10 has ____ neutrons and Boron 11 11B has ____ neutrons.
The relative atomic mass of boron is 10.81 This means that the Boron ____ isotope is more abundant than the Boron ____ isotope as the relative atomic mass depends on the masses and the abundances of the ____ in the sample.

Other Answer Choices:

isotopes

5

6

5

Boron has an atomic number of ____ as there are 5 protons in the nucleus.
As the atom is neutral the boron atom must have ____electrons 
The electron configuration shows that boron is in period ____ as there are two numbers.
The electron configuration shows that boron is in group ____as the final number is ____.  

Other Answer Choices:

5

2

3

Copy of Year 9 atomic structure 2025-2026 (20/12/2025)

The atomic number of atom L is __________.

The mass number of atom L is __________.

Which particles are present in the nuclei of both atoms?

The atomic number of atom L is __________.

The mass number of atom L is __________.

Atoms L and M are neutral because

The particle furthest from the centre of each atom is...

Atoms are neutral because they have the same number of...