the periodic table

Question 1

in what order are the elements of the periodic table arranged in ?

Answer 1

increasing atomic number

atomic number =protons

Question 2

If elements are in the same group, what do they have in common?

Answer 2

Elements in the same group have the same number of electrons in their outer shell and so have similar properties meaning the will react in a similar way

Question 3

What makes the periodic table periodic?

Answer 3

because similar properties occur at regular intervals

Question 4

What are the groups and periods of the periodic table?

What do they show?

Answer 4

groups are columns = electrons in outer shell

periods are rows = number of shells

Question 5

what are the properties of metals?

Answer 5

shiny
mostly solid
dense and strong
malleable
good heat and electrical conductors
from basic oxides
high m.p and b.p

Question 6

How is the modern day way of arranging elements different to the past way.

Answer 6

Today, we rank elements by their atomic number (protons in nucleus)
Before sub-atomic particles were discovered, scientists tried to sort elements by their mass.

Question 7

Who was John Newland’s?

Why was his table problematic?

Answer 7

John Newlands was the first chemist to devise a periodic table

Question 8

What are the properties of non metals

Answer 8

low m.p and b.p
do not conduct electricity (apart from graphite)
dull
brittle
low
acidic oxides

Question 9

early periodic tables were incomplete and element were placed in inappropriate groups of what was to be followed?

Answer 9

the strict order of atomic weights

Question 10

Knowledge of what made it possible to explain why the order based on atomic weights was not always correct?

Answer 10

isotopes

Question 11

Mendeleev overcame some problems with the table b doing what?
He also changed the order of some elements based on what?

Answer 11

Leaving gaps for undiscovered elements… he was able to predict their properties and masses

atomics weights

Question 12

When metals react they….

Answer 12

lose 1 or more negatively charged electrons to form positively charged ions

Question 13

Elements that do not form positive ions are …

Answer 13

Non-metals

Question 14

What has the discovery of protons and isotopes shown about Mendeleev’s way of ordering the elements.

Answer 14

The discovery of protons and isotopes show that Mendeleev ordered elements exactly by atomic number (proton number)

Question 15

When non-metals react…..

Answer 15

they either

gain electrons to form negatively charged ions

or

share electrons to form neutral molecules