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Bonding & Reactions

Science 8: Chemical Bonding and Reactions

QuestionAnswer
chemical bonding Joining of atoms to form new substances. Properties of new substances are different from those of the original elements.
chemical bond Force of attraction that holds two atoms together.
how do you determine the number of electrons in an atom? by the atomic number of the element
What is the atomic number? It is the number of protons in an element
How are electrons organized in an atom? electrons are organized in energy levels in the atom
Which levels in an atom have the most energy? levels furthest from the nucleus
What are valence electrons? electrons in the outermost energy level in the atom.
How many valence electrons are in groups 1 & 2 on the Periodic Chart? The elements in groups 1 & 2 have the same number of electrons as the group number. For example, Group 1 elements have 1 electron.
Do Groups 3 o 12 do not have a general rule relating to their valence electrons to their group number. Yes, true.
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