A metal can be defined as something that...

forms positive ions as it loses electrons

Early periodic tables were incomplete because...

elements with different properties were grouped together

How is the modern periodic table ordered?

In order of atomic number (number of protons)

What did Mendeleev predict?

Properties of undiscovered elements

A non-metal can be defined as something that...

forms negative ions as it gains electrons

How did Mendeleev overcome this problem?

By leaving gaps for elements that hadn't been discovered

Why did the ordering of the elements by atomic weight only fail?

Isotopes. There are different types of the same element.

Why are the noble gases in group 0?

They need 0 electrons to gain a full outer shelf electrons

Are unreactive as they have a full outer shell of electrons

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Development of the periodic table & metals/non-metals as ions

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Development of the periodic table - year 9

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Questions 12

Answers

1
A metal can be defined as something that...
forms negative ions as it gains electrons
forms positive ions as it loses electrons
forms negative ions that lose electrons
forms positive ions as it gains electrons
2
Early periodic tables were incomplete because...
Newlands left gaps
elements with different properties were grouped together
all elements had been discovered
compounds with different properties were grouped together
3
How is the modern periodic table ordered?
In order of atomic number (number of protons)
In order of atomic number (number of neutrons)
In order of relative atomic mass
In order of mass number (number of protons)
4
What did Mendeleev predict?
Properties of undiscovered compounds
Properties of undiscovered elements
The Russian standard of vodka
5
A non-metal can be defined as something that...
forms positive ions as it gains electrons
forms positive ions as it loses electrons
forms negative ions as it gains electrons
forms negative ions as it loses electrons
6
How did Mendeleev overcome this problem?
By ordering the elements in order of their proton number
By grouping compounds that have similar properties
By leaving gaps for elements that hadn't been discovered
7
Where are metals found on the periodic table?
On the left
On the right
8
Why did the ordering of the elements by atomic weight only fail?
Because compounds form isotopes.
Because gaps were present in the periodic table
Isotopes. There are different types of the same element.
9
Why are the noble gases in group 0?
They will not gain a full outer shell of electrons.
They need 0 electrons to gain a full outer shelf electrons
They have 0 electrons in their outer shell
Their reactivity is 0
10
Before the discovery of protons, neutrons and electrons, how was the periodic table arranged?
In order of proton number
In order of atomic number
In order of atomic weights
11
Group 0 elements...
Are reactive as they have a full outer shell of electrons
Are reactive as they don't have a full outer shell
Are unreactive as they do not have a full outer shell
Are unreactive as they have a full outer shell of electrons
12
Where are non-metals found?
On the right
On the left

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