Atomic Structure (chemistry)

Question 1

what is Dalton’s Model

Answer 1

the model of the atom in the early 19th century when john dalton described atoms as solid spheres which made up the different elements.

Question 2

what is Thomson’s Model;=

Answer 2

thomson concluded that the atoms must contain even smaller negatively charged particles called electrons which were scattered throughout the positively charged atom

Question 3

what is Rutherford’s Model

Answer 3

conducted gold foil experiment they found out that the atom was made up opf mostly empty space with a very dense positibvely charged center. this was called the nuclear model

Question 4

Bohrs model

Answer 4

electrons exist in fixed orbitals around the nucleus whenever an electron moves between shells electromagnetic radiation is emitted or absorbed, because the energy of shells is fixed the radiation will have a fixed frequency.

Question 5

what is relative atomic mass

Answer 5

the average mass of an atom of an element on a scale where a carbon-12 atom is exactly 12

Question 6

what is relative isotopic mass

Answer 6

the mass of an atom of an isotope of an element on a scale where an atom of carbon-12 is exactly 12

Question 7

formula for relative atomic mass

Answer 7

isotopic massesxpercentages over 100

Question 8

formula for relative molecular mass

Answer 8

the sum of the relative atomic mass values of all atoms in the molecule

Question 9

what are the 4 stages in a mass spectometer

Answer 9

1. ionisation
2. acceleration
3. ion drift
4. detection