Answer:
POLAR COVALENT
Explanation: A polar covalent bond is a covalent bond in which the atoms have an unequal attraction for electrons and so the sharing is unequal. In a polar covalent bond, sometimes simply called a polar bond, the distribution of electrons around the molecule is no longer symmetrical.
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90 chemical elements have two letters in their symbols.
1. Pipette, measuring cylinder
6 protons, 7 neutrons, and if it has no charge then it has 6 electrons