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What’s the scientific notation for the number 6,840,000,000

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Why is soap used to remove grease? a. its nonpolar end dissolves the grease. b. it makes the water bond with the grease. c. it chemically bonds with the grease. d. its polar end dissolves the grease.correct answer for apex - a, its nonpolar end dissolves the grease.