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LD Chemistry Quiz #2

LD Chemistry - Bohr Model & Electron Dot - Quiz #2

What are protons, electron and neutrons? subatomic particles
Proton ( charge, location, relative mass in amu?) positively charged, relative mass of 1 amu, in nucleus
Electron ( charge, location, relative mass in amu? negatively charged, relative mass of 1/2000 or 2000 less massive then proton or neutron, located outside the nucleus.
Neutron ( charge,location, relative mass in amu?) neutral subatomic particle, found in nucleus, mass exactlly as proton- approximately 1 amu
What is the atomic number? number of protons in an atom of specific element
Atoms of different elements have ______________ of protons different number
What is mass number? sum of protons and neutrons in the nucleus of an atom
How do you calculate number of neutrons? mass number - atomic number
What are isotopes? atoms of the same element that have different number of neutrons and different mass number
What is the same for the isotopes of the same element? atomic number ( number of protons)
What is this C- 14? isotopic notation for the isotope of carbon that has mass number of 14
Explain how different mass numbers of isotopes contribute to the average atomic weight for a given element. The average atomic mass for an element is calculated by summing the masses of the element's isotopes, each multiplied by its natural abundance on Earth.
In a neutral atom: amount of protons and electrons is equal
In an isotope: number of protons is the same, but the number of neutrons is different for different isotopes of the same element.
In an ion: number of electrons and protons is no longer equal.
Ion atom that has a net negative or positive charge .
How is charge represented? by plus or minus sign after the number
Anion ion with a negative charge
Cation ion with a positive charge
Explain Cl 1- it is a chlorine atom that has one extra electron, it is negativelly charged, called anion
Explain Na 1+ It is a sodium ion that has one extra proton ( it lost one electron), it has positive charge, it is called cation
Which distinguished an atom of one element from atom of a different element? number of protons
Describe an atom: a core of protons and neutrons surrounded by electrons
What is found the farthest from the center of the atom? electron
Compare subatomic partciles electron-negative-smallest mass,around nucleus neutron-neutral- mass as proton-in the nucleus proton-positive-in nucleus-mass as neutron
If neutral atom of silver (Ag) has 47 protons, how many electron will orbit its core: 47
Subatomic particles found inside the nucleus of an atom proton and neutron
Describe the relationship of subatomic particle in a neutral atom the number of protons equal the number of protons
Who developed atomic theory of matter? Dalton
The Planetary model? Rutherford
The Solid sphere? Dalton
Who discovered the nucleus? Rutherford
The Cathode ray tube experiment? Thomson
All elements are composed of atoms? Dalton
Plum pudding model? Thomson
Gold foil experiment? Rutherford
Discovered electron? Thomson
Model with electrons orbiting energy levels? Bohr
Created by: desilva13



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