the atom content Flashcards
How many neutrons are in an element of Lithium?
4
Atomic mass rounded minus the atomic number.
How many protons are in a atom of Aluminum?
13
Same as the atomic number.
How many electrons are in a neutral atom of Sulfur?
16
Same as the number of Protons
Match the Chemist with their atomic theory…
Chemist: Bohr, Dalton, Democritus, Rutherford, Thompson
Discovery: Defined a structure for Atoms (spheres with known mass), Electron Orbitals, Found negatively Charged particles, Found Nucleus, Matter made of undividable parts.
Bohr- Electron Orbital Dalton- Defined a structure for an atom Democritus- Matter made of undividable parts Rutherford- Found Nucleus Thompson- Found charged particles.
Tell whether the following particles have a positive, negative, or neutral charge.
Electron, Neutron, Proton
Electron - Negative
Neutron - Neutral
Proton - Positive
Where would you find the following particles in an atom?
Electron, Proton, Neutron
(Answer choices- Nucleus, Electron Cloud, Both)
Electron - Electron Cloud
Proton - Nucleus
Neutron - Nucleus
What is the mass in a.m.u of the following particles?
Electron, Neutron, Proton
Electron is about zero.
Protons and neutrons are about 1.
What is an isotope?
What is the main difference between an isotope and a “normal” atom?
An isotope has more or less neutrons than other atoms of the same substance.
An isotope will have a different atomic mass.
What will happen to the electrons of an atom when the atom gains energy?
The electron will get excited and move to a higher energy orbital.
When the electron goes down an energy level they release a photon producing light.
How is the electron cloud different from orbitals?
A cloud is an area where an electron is more likely to be as opposed to a path that the electrons follow.
The cloud is the more modern theory.
