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oksano4ka [1.4K]
3 years ago
7

The modern periodic table is arranged by increasing

Chemistry
1 answer:
Lilit [14]3 years ago
5 0

The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.

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For the following reaction, provide the missing information
jenyasd209 [6]

Answer:

19. Option B. ⁰₋₁B

20. Option D. ²¹⁰₈₄Po

Explanation:

19. ²²⁸₈₈Ra —> ²²⁸₈₉Ac + ʸₓZ

Thus, we can determine ʸₓZ as follow:

228 = 228 + y

Collect like terms

228 – 228 = y

y = 0

88 = 89 + x

Collect like terms

88 – 89 = x

x = –1

Thus,

ʸ ₓZ => ⁰₋₁Z => ⁰₋₁B

²²⁸₈₈Ra —> ²²⁸₈₉Ac + ʸₓZ

²²⁸₈₈Ra —> ²²⁸₈₉Ac + ⁰₋₁B

20. ᵘᵥX —> ²⁰⁶₈₂Pb + ⁴₂He

Thus, we can determine ᵘᵥX as follow:

u = 206 + 4

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v = 82 + 2

v = 84

Thus,

ᵘᵥX => ²¹⁰₈₄X => ²¹⁰₈₄Po

ᵘᵥX —> ²⁰⁶₈₂Pb + ⁴₂He

²¹⁰₈₄Po —> ²⁰⁶₈₂Pb + ⁴₂He

8 0
3 years ago
How do lawmakers make good environmental decisions??
Sliva [168]
<h2>Answer : By weighing the costs and benefits of an environmental issue </h2><h3> Explanation :</h3>

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They also weigh the cost aspect along with the benefit of the ongoing environmental issue. They try to come up with something which appears to be cost effective and result bearing.

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sattari [20]

Answer:

See explanation

Explanation:

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This idea has been the longest surviving atomic model and has greatly increased our understanding of atoms.

7 0
3 years ago
What is the difference between atomic elements and molecular elements?
mylen [45]
The molecular element describes the amount of protons, neutrons, and electrons found in an atom

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6 0
3 years ago
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What are the 3 Newton laws
gulaghasi [49]

Answer:

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(3) For every action, there is an equal and opposite reaction.

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