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chemistry
chemistry with atoms solutions etc
Question | Answer |
---|---|
Who discovered the existence of atoms | Dmitri Mendeleev |
Which subatomic particle has a negative charge | Electrons |
Which has a positive charge | Protons |
which has a neutral charge | Neutrons |
Who discovered the first subatomic particle | Ernest Rutherford and Frederick Soddy |
What does the atomic number tell you about an atom | The number of protons found in the nucleus of an atom |
Can two elements have the same atomic number | No,because the number of protons determines the elements |
What does the atomic mass tell you about an atom | The number of protons and neutrons in the nucleus of the atom |
Can two elements have the same atomic mass | Yes the number of neutrons for two different elements might give them the same mass |
Which element is the lightest | Hydrogen |
How many electrons can the first electron shell hold | Two |
How many can the second electron shell hold | Eight |
How many naturally occurring elements are there | 92 |
Who developed the periodic table | Dmitri Mendeleev |
Who’s atomic model is sometimes known as the plum pudding model | J. J. Thomson |
Which two scientists came up with the planetary model | Neil Bohr and Ernest Rutherford |
Which subatomic particles are the heaviest | neutron |
Which subatomic particles are found in the nucleus | Protons and neutrons |
Who discovered the proton | Ernest Rutherford |
Who discovered the neutron | James Chadwick |
Where is most of the mass of an atom found | Nucleus |
Define isotope | each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons |