Atomic Structure (CIE AS Chemistry)

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In 1808 John Dalton published his atomic theory. This was the first complete attempt to describe matter in terms of atoms and contained four theories.

Which of his theories is still considered to be correct today?

All matter is made of indivisible atoms.
All atoms are very small in size.
All the atoms of one element are different in mass from all the atoms of other elements.
All atoms of the same element will have the same mass.

Choose your answer

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1	Increases moving down the group
2	Increases moving down due to the addition of electron shells
3	Decreases moving down due to increasing nuclear forces

1	The negative charge is concentrated in one area outside the nucleus.
2	The mass is concentrated inside the nucleus.
3	The negative charge is spread around outside the nucleus.

1	The charge on the nucleus is +27.
2	There are 33 neutrons in the nucleus.
3	It has the same number of neutrons as other isotopes of cobalt.

	1	The proton and electron are deflected because they are charged particles.
	2	The neutrons are undeflected as they have no charge.
	3	The electron is deflected more than the proton because it has less mass.

1	Electrons shells are added moving across which increases the nuclear force of attraction.
2	The nuclear charge increases moving across due to increasing atomic number.
3	There is a greater force of attraction between the nucleus and the electrons.

	1	⁴⁰Ca⁺
	2	³⁹K⁺
	3	³⁸Ar