Question | Answer |
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 |