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love history [14]
2 years ago
13

Which of the following statements describes the law of conservation of mass?

Chemistry
1 answer:
SCORPION-xisa [38]2 years ago
8 0

Explanation:

I think a is correct answer

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What things typically are counted in multiples or fractions of moles
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Individually well, defined identical chemically units such as molecules, ions, atoms, or electrons

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The mole is used as the unit of measurement for substance such as molecules, ions, atoms, or electrons. One mole of a substance is equivalent to 6.02×10²³ particles of the substance. The number, 6.02 × 10²³ is known as Avogadro's number.

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How many valence electrons do the halogens possess? group of answer choices
jok3333 [9.3K]

The valence electron does the halogens possess are 7

  • Valence electrons are found in the outermost energy level of an atom
  • They are involved in the formation of chemical bonding with other atoms.
  • The halogens elements are found in group 17 on the periodic table
  • The halogens include fluorine, chlorine, bromine, iodine and astatine.
  • They have seven valence electrons, so they are extremely reactive as they only need one more to fill their outer shell.
  • By octet rule we can say that the electron with 8 outer most shell is full and stable.

Hence the halogens posses 7 valence electron

Learn more about the valence electron on

brainly.com/question/13552988

#SPJ4

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What is the abbreviation for the element with atomic number 11?
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Answer:

Sodium (Na) has atomic number 11.

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