SC8

Question 1

How have Dalton’s ideas about atoms have changed?

Answer 1

Dalton viewed atoms is invisible speares. Now we know they contain protons, neutrons, and electrons

Question 2

atomic particles arranged in an atom

Answer 2

Protons and neutrons are in the nucleus. Electrons are in the shells around it.

Question 3

Charges and relative mass of the three subatomic particles

Answer 3

Protons = relative charge = = + one relative mass = 1 neutrons = relative charge = one relative mass = plus one electrons = relative mass = one/1835 relative charge equals = - one

Question 4

atoms have no overall charge

Answer 4

Put on an electrons are equal number cancelling their charges

Question 5

How does the size of an atom compared to the size of a nucleus?

Answer 5

Nucleus is tiny compared to an atom, about 100,000 times smaller

Question 6

where is the most of the mass of an atom Found

Answer 6

Nucleus

Question 7

What is the meaning of mass number?

Answer 7

it is the number of protons in the nucleus of an atom and it defines that element

Question 8

how do you atoms of different elements value?

Answer 8

Different atomic numbers to a different number of protons. All element elements of the same element have the same atomic number.

Question 9

how can you determine the number of protons in an atom?

Answer 9

Atomic number Z = = number of protons

Question 10

You determine the number of electrons in an atom

Answer 10

Atomic number a - atomic number Z = number of neutrons

Question 11

What is meant by an isotope?

Answer 11

of the same element with the same protons but different neutrons (mass numbers)

Question 12

Relative atomic masses of any element, not a whole number

Answer 12

additive atomic mass takes into account the present and abundance of all isotopes of an element when calculating the relative atomic mass