The Full Wiki


More info on Atomic number

Atomic number: Quiz


Question 1: The atomic number, Z, should not be confused with the mass number, A, which is the total number of protons and ________ in the nucleus of an atom.
Atomic nucleusNeutronElectronNeutrino

Question 2: Since protons and neutrons have approximately the same mass (and the mass of the electrons is negligible for many purposes), the ________ of an atom is roughly equal to A.
Atomic massMolar massChemistryOxygen

Question 3: Among other things, Moseley demonstrated that the lanthanide series (from ________ to lutetium inclusive) must have 15 members — no fewer and no more — which was far from obvious from the chemistry at that time.

Question 4: This led to the conclusion (Moseley's law) that the atomic number does closely correspond (with an offset of one unit for K-lines, in Moseley's work) to the calculated ________ of the nucleus, i.e.
Magnetic fieldElectric chargeElectric currentElectromagnetism

Question 5: Atoms having the same atomic number Z but different neutron number N, and hence different atomic mass, are known as ________.
Stable nuclideActinoidTechnetiumIsotope

Question 6: In an atom of neutral charge, the atomic number is also equal to the number of ________.

Question 7: Most naturally occurring elements exist as a mixture of isotopes, and the average atomic mass of this mixture determines the element's ________.
BoronAtomic weightFluorineAvogadro constant

Question 8: In general, the ________ becomes shorter as atomic number increases, though an "island of stability" may exist for undiscovered isotopes with certain numbers of protons and neutrons.
Half-lifeCosmic rayRadioactive decayNuclear fission

Question 9: The configuration of these electrons follows from the principles of ________.
Quantum mechanicsWave–particle dualitySchrödinger equationIntroduction to quantum mechanics

Question 10: In chemistry and physics, the atomic number (also known as the proton number) is the number of protons found in the nucleus of an ________ and therefore identical to the charge number of the nucleus.


Got something to say? Make a comment.
Your name
Your email address