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Description
Flashcards by rebekah eh., updated more than 1 year ago
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Created by rebekah eh.
almost 7 years ago
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| Question | Answer |
| What is the difference between covalent bonds and ionic bonds? | Ionic bonds can happen between both metals and non - metals, whereas covalent bonds can only happen between non -metals. |
| What is an isotope? | Isotopes are atoms of the same element, they have the same atomic number but different mass numbers. They also have a different number of neutrons but the same number of protons. |
| Why did Dmitri Mendeleev leave gaps in the first periodic table? | To make predictions about the properties of undiscovered elements. |
| Why did people eventually believe Mendeleev? | He predicted the properties for an undiscovered element he called eka-aluminium, which was found to fit the element gallium very closely, when discovered in 1875. |
| What is the rule of electronic configuration? | 2 in the first shell, 8 in the second and third, 18 in the fourth, then infinity in the fifth. |
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