The Periodic Table CH4

Question 1

What Irish chemist defined the element?

Answer 1

Robert Boyle

Question 2

What is a element?

Answer 2

A substance that can’t be split into a simper substance by chemical means

Question 3

What did Humphrey Davy do?

Answer 3

Humphrey Davy discovered many elements by passing electricity through compounds

Question 4

What is a triad?

Answer 4

a group of three elements with similar chemical properties in which the middle element is the average atomic weight of the other two.

Question 5

what did John Newlands do?

Answer 5

Arranged elements by their atomic weights.

Question 6

Law of octaves

Answer 6

Newlands octaves are arrangements of elements in which the first and eighth elements have similar properties.

Question 7

Issues with Newlands Octaves?

Answer 7

Some elements had not been discovered yet, he should have left gaps for them and noble gases.

Question 8

Mendeleev’s Periodic Table

Answer 8

Arranged elements in order of increasing atomic weight and placed elements with similar properties under each group.

Question 9

Mendeleev’s Law

Answer 9

When elements are arranged in order of increasing atomic weight, the properties of the elements recur periodically.

Question 10

Why did he reverse some elements?

Answer 10

He reversed the order of some elements, he placed more importance on properties rather than atomic weight. ( tellurium and iodine)

Question 11

Who discovered the number of protons in a nucleus. Atomic number?

Answer 11

Mosley

Question 12

What did Mosey show?

Answer 12

Elements should be arranged by atomic number not atomic mass.

Question 13

Modern periodic law

Answer 13

When elements are arranged in order of increasing atomic number, the properties of the element recur periodically

Question 14

Atomic Numbers

Answer 14

The number of an element in the periodic table tells us the number of protons in the nucleus.

Question 15

Mass Numbers

Answer 15

The mass numbers of an element is the sum of the number of protons and the number of neutrons of the atom of that element.

Question 16

Isotopes

Answer 16

Atoms of the same element which have different mass numbers due to different numbers of neutrons in the nucleus.

Question 17

What is a mass spectrometer?

Answer 17

a instrument used to detect the masses of an atom.

Question 18

Relative atomic mass

Answer 18

The average mass numbers of the isotopes of the element taking their abundances into account and expressed on a scale in which the atoms of the carbon12 isotope have a mass of exactly 12

Question 19

Principle of mass spectrometry

Answer 19

Charged particles in a magnetic field are deflected to different extents according to their masses and thus separated according to these masses

Question 20

Mass spectrometry uses?

Answer 20

identifying unknown substances, drug testing. Forensic science and space travel studying.

Question 21

Electron configuration

Answer 21

Shows the arrangement of electrons in an atom.

Question 22

Aufbau principle

Answer 22

When building up electrons configuration of an atom in its ground state, the electrons occupy the lowest available level.

Question 23

Hund’s rule of maximum multiplicity

Answer 23

States that when two or more orbitals of equal energy are available, the electrons occupy them singly before filling them in pairs.

Question 24

Pauli Exclusion Principle

Answer 24

States that no more then two electrons may occupy an orbital and they must have opposite spin.