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Chemistry

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1What 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.
2What 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.
3Why did Dmitri Mendeleev leave gaps in the first periodic table?To make predictions about the properties of undiscovered elements.
4Why 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.
5What 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.