Hello Year 9! Week 9 chemistry I hope you are all doing okay · 2020. 6. 8. · Hello Year 9! Week...

Hello Year 9! Week 9 chemistry

I hope you are all doing okay

Work through the slides and copy out information into your chemistry book when asked to.

Any problems:e.shore@bishopchalloner,bham.sch.uk

mailto:e.shore@bishopchalloner,bham.sch.uk

SC4bThese are the specification points you need to

understand from this work

SC4b

Atomic number and the periodic table

Objectives:

To know how Mendeleev arranged elements

into the periodic table.

To understand that some elements were easier

to discover than others.

To understand why the iodine-tellurium reversal

was correct.

To be able to answer questions.

SC4b

Starter

How many of the following questions can you

answer?

SC4b Atomic number and the periodic table

Quick Quiz1. Which number tells you how many protons there

are in a nucleus?

2. Sodium atoms have 11 electrons. How many

protons do they have?

3. Where are electrons found in an atom?

© Pearson Education Ltd 2015. Copying permitted for purchasing institutions only. This material is not copyright free.


Answers


Quick Quiz1. Which number tells you how many protons there

are in a nucleus?

atomic number

2. Sodium atoms have 11 electrons. How many


11

3. Where are electrons found in an atom?

orbiting around the nucleus in shells



Quick Quiz4 Sodium atoms have 11 electrons. How many


5 Where are electrons found in an atom?

6 What number did Mendeleev use to order the

elements?



Answers


Quick Quiz4 Sodium atoms have 11 electrons. How many


11

5 Where are electrons found in an atom?

orbiting around the nucleus in shells

6 What number did Mendeleev use to order the

elements?

relative atomic mass


SC4b


Objectives:



To understand that some elements were

easier to discover than others.


was correct.


SC4b

Not all elements were discovered at the same time. They

were discovered over many years.

Element discovery

Copy this writing into your

chemistry book

SC4b1n 1700 the following elements were discovered.

In your books write down the year and the symbols and

names of 3 of the elements.

You will need to use your periodic table to help you with their

names

1700

SC4b

1750

1n 1750, 2 more elements were discovered.

Can you spot them?

In your books write down the year, the symbols and names

of these 2 elements.

SC4b

1800

By 1800, lots more elements were discovered.


names of 4 of these new elements.

SC4b

1850


names of 4 new elements.

SC4b

Today this is what the modern

periodic table looks like.

SC4bThe elements in the modern periodic table are

arranged in order of increasing atomic number

(bottom number) and not in order of increasing

relative atomic mass (top number) as Mendeleev

did.

Copy

writing

SC4b

Question

What does the atomic number tell you about an atom?

SC4b

The atomic number tells you the

number of protons in an atom.

Copy the writing

© Boardworks Ltd 2004

H

Li

Na

K

Rb

Cs

Fr

Be

Mg

Ca

Sr

Ba

Ra

Ga

In

Tl

Al

B

Ge

Sn

Pb

Si

C

Sb

Bi

P

N

As Se

Te

Po

O

S

He

Kr

Ne

Ar

Rn

Xe

Sc Ti V Cr Mn Fe Co Ni Cu Zn

Y Zr Nb Mo Tc Ru Pd Ag CdRh

Hf Ta W Re Os Ir Au HgLa Pt

Rf Db Sg Bh Hs Mt ? ?Ac ?

Br

At

Cl

F

I

The columns of elements are called groups.

7654321 0Group number

Copy the red writing


H

Li

Na

K

Rb

Cs

Fr

Be

Mg

Ca

Sr

Ba

Ra

Ga

In

Tl

Al

B

Ge

Sn

Pb

Si

C

Sb

Bi

P

N

As Se

Te

Po

O

S

He

Kr

Ne

Ar

Rn

Xe

Sc Ti V Cr Mn Fe Co Ni Cu Zn

Y Zr Nb Mo Tc Ru Pd Ag CdRh

Hf Ta W Re Os Ir Au HgLa Pt

Rf Db Sg Bh Hs Mt ? ?Ac ?

Br

At

Cl

F

I

7654321 0Group number

If you have a copy of the periodic table in your

book, label the columns with their group number

SC4b

Elements with similar chemical

properties are placed in the same

group.



Rows of elements

H He

Li Be N O F NeB C

Na Mg Al P S Cl ArSi

K Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge Se BrCa KrAs

Rb Y Zr Nb Mo Tc Ru Pd Ag Cd In Sn SbSr TeRh I Xe

Cs Ba Hf Ta W Re Os Ir Au Hg Tl Pb Bi PoLa AtPt Rn

Fr Ra Rf Db Sg Bh Hs Mt ? ?Ac ?

1

2

3

4

5

6

7

Period number


The rows of elements are called periods..


H He

Li Be N O F NeB C

Na Mg Al P S Cl ArSi

K Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge Se BrCa KrAs

Rb Y Zr Nb Mo Tc Ru Pd Ag Cd In Sn SbSr TeRh I Xe

Cs Ba Hf Ta W Re Os Ir Au Hg Tl Pb Bi PoLa AtPt Rn

Fr Ra Rf Db Sg Bh Hs Mt ? ?Ac ?

1

2

3

4

5

6

7

Period number

The rows of elements are called periods..

If you have a copy of the periodic table in your book,

label the rows with their period number

SC4b


Objectives:





To understand why the iodine-tellurium

reversal was correct.


SC4b

What is unusual about Te and I?

SC4b

What is unusual about Te and I?When Mendeleev was constructing his Periodic

table he did not know about isotopes. He knew

he needed to reverse Te and I because of their

chemical properties.

When isotopes were discovered the RAM of Te

was in fact higher than I but its atomic number

was only 52.

Mendeleev had been right all along to swap Te

and I. The proton had not been discovered yet.


SC4b

Looking at the chemical properties of Te and I, it clearly

shows that they are now in the correct position.

Read

SC4b


Objectives:






was correct.


SC4bWhat labels would you put in each of the boxes?


Answers

SC4b

relative

atomic mass

atomic

number

symbol group

number

periodgroup

SC4b

Questions


Answers

SC4b

The relative atomic mass of tellurium is 128 which is greater than

that of iodine; 127.

The atomic number of tellurium is 52 which is less than that of iodine

whose atomic number is 53.

Isotopes

SC4b

Questions


Answers

SC4b

Number of protons in an atom

They have similar chemical properties

Well done for completing week 9 chemistry

Hello Year 9! Week 9 chemistry I hope you are all doing okay · 2020. 6. 8. · Hello Year 9! Week...

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