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Tanya [424]
3 years ago
12

Which of these is an example of a physical change? Question options: melting a substance breaking chemical bonds forming chemica

l bonds nuclear decay
Chemistry
2 answers:
bogdanovich [222]3 years ago
8 0
Breaking chemical bonds
kherson [118]3 years ago
4 0
Your answer is Breaking chemical bonds. Hope this helps
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How many valence electrons does an atom of any halogen have?
Makovka662 [10]
All halogens are stable so they have 8 electrons in their last shell
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How many of each subatomic particle type does each of the following atoms contain: a. 90_Ag b. barium-132
Kryger [21]

<u>Answer:</u> Silver has 47 electrons, 47 protons and 43 neutrons. Barium has 56 electrons, 56 protons and 76 neutrons.

<u>Explanation:</u>

Atomic number is defined as the number of protons or electrons that are present in a neutral atom.

Atomic number = number of protons = number of electrons

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.

Mass number = Number of protons + Number of neutrons

  • <u>For Silver:</u>

Atomic number = 47

Mass number = 90

Atomic number = Number of protons = Number of electrons = 47

Number of neutrons = Mass number - Atomic number = 90 - 47 = 43

Hence, silver has 47 electrons, 47 protons and 43 neutrons.

  • <u>For Barium:</u>

Atomic number = 56

Mass number = 132

Atomic number = Number of protons = Number of electrons = 56

Number of neutrons = Mass number - Atomic number = 132 - 56 = 76

Hence, barium has 56 electrons, 56 protons and 76 neutrons.

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