different mass numbers, the same atomic numbers

How did Davy discover elements?

Passing electricity through compounds

The 1st and 8th element have similar properties.

What is the principal behind mass spectrometry?

particles reflected according to their mass.

The electron configuration of Cu is

1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d10

The middle element in a triad.

Roughly half of the atomic weight of the other two elements.

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Periodic Table

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Revise the history of the periodic table.

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Questions 15

Answers

1
Isotopes have
the same mass number
different mass numbers
the same atomic numbers
different atomic numbers
2
Who was the first to define an element?
Davy
Heisenberg
Newland
Boyle
3
How many electrons does Na have?
11
12
22
23
4
How did Mendeleev organize his periodic table?
Increasing atomic weight.
By leaving gaps.
Decreasing atomic weight.
He guessed
5
Which do you fill first?
3d
4p
4s
3p
6
How did Davy discover elements?
Flame test.
Line spectrum
Titration
Passing electricity through compounds
7
What isotope is used as a scale with relative atomic mass?
Carbon-13
Carbon-14
Carbon-12
Carbon-11
8
In Newlands Octaves
The 1st and 8th element have similar properties.
The 2nd, 4th, 6th & 8th have the same properties.
Every element in an octave has the same properties.
The 1st and 8th element have exactly the same properties.
9
Which is not a stage in mass spectrometry?
Vaporisation
Detection
Ionisation
Decceleration
10
What is the principal behind mass spectrometry?
particles reflected depending in their shape.
particles reflected according to their mass.
particles reflected depending in their charge.
particles deflected according to their atomic number.
11
Electrons occupy which energy levels first?
Highest
s
Lowest
p
12
How many neutrons does N have?
6
7
21
14
13
The electron configuration of Cu is
1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d4
1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d9
1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d5
1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d10
14
The middle element in a triad.
Discovered by Dobereiner
Has the exact same properties of the other two elements.
exactly half the atomic weight of other two.
Roughly half of the atomic weight of the other two elements.
15
How did Moseley organize his periodic table?
Mass number
Atomic number
Their properties
Relative atomic mass

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