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Y_Kistochka [10]
3 years ago
9

1. As elements go across from left to right in a period,

Chemistry
1 answer:
mel-nik [20]3 years ago
7 0

Answer:

decrease.

Explanation:

WHY? - As you go across a period, electrons are added to the same energy level. ... The concentration of more protons in the nucleus creates a "higher effective nuclear charge." In other words, there is a stronger force of attraction pulling the electrons closer to the nucleus resulting in a smaller atomic radius.

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What would you multiply "moles of oxygen" by to get the units "grams of oxygen"?
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Answer:

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Explanation:

to go from moles to grams you multiply by the Atomic Mass or Molar Mass (Atomic Mass for an element and Molar Mass for a compound).

The formula is:

Mass = moles * MM

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C. Distributive property
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Help me please with this question
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Answer:

[Ne] 3s2 3p1

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Explanation:

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The radioactive isotope 210/84 Po decays by alpha emission.
yan [13]

The half-life of polonium-210, given that it decays from 98.3 micrograms to 12.3 micrograms in 414 days is 138 days

<h3>How to determine the number of half-lives </h3>
  • Original amount (N₀) = 98.3 micrograms
  • Amount remaining (N) = 12.3 micrograms
  • Number of half-lives (n) =?

2ⁿ = N₀ / N

2ⁿ = 98.3 / 12.3

2ⁿ = 8

2ⁿ = 2³

n = 3

<h3>How to determine the half life </h3>
  • Number of half-lives (n) = 3
  • Time (t) = 414 days
  • Half-life (t½) = ?

t½ = t / n

t½ = 414 / 3

t½ = 138 days

Learn more about half life:

brainly.com/question/26374513

#SPJ1

4 0
2 years ago
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