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jonny [76]
3 years ago
12

Write a definition of isotope in your own words . Please help

Chemistry
2 answers:
marshall27 [118]3 years ago
4 0
Two forms of the same element
mojhsa [17]3 years ago
3 0

Isotopes are basically, different types of the same atom. Isotopes are atoms that have different neutron numbers but the same proton numbers.

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Solid sodium metal reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrog
asambeis [7]

Answer:

4.6 × 10²³ molecules:

Step-by-step solution

You will need a balanced equation with masses, moles, and molar masses, so let's gather the information in one place:

M_r:  22.99

          2Na + 2H₂O ⟶ 2NaOH + H₂

m/g:    35

1. Calculate the <em>moles of Na </em>

Moles of Na = 35 g Na × (1 mol Na/22.99 g Na)

Moles of Na = 1.52 mol Na

2. Calculate the <em>moles of H₂ </em>

Moles of H₂ = 1.52 mol Na × (1 mol H₂/2 mol Na)

Moles of H₂= 0.761 mol H₂

3. Calculate the molecules of H₂

6.022 × 10²³ molecules H₂ = 1 mol H₂

                Molecules of H₂ = 0.761 × (6.022 × 10²³ /1)

                Molecules of H₂ = 4.6 × 10²³ molecules H₂

The reaction forms 4.6 × 10²³ molecules of H₂.

5 0
3 years ago
When this element was discovered, it exhibited luster and malleability, and it reacted very vigorously with water. This element
TEA [102]

Answer:

a) alkali metals

Explanation:

The element described above definitely belonged to the alkali metals, the first group on the periodic table. They show the properties indicated in the text.

  • They are metals because only metals are lustrous and malleable. This eliminates the possibility of them being halogens and noble gases.
  • Only group 1 metals reacts vigorously with water to form alkali.
  • Alkali are aqueous solutions that are basic in nature.
  • The reactivity of group 1 metals is due to their one extra electrons in the outer most shell.
  • These electrons are easily and readily lost in order for such atoms to gain stability and replicate the nearest noble gases.
  • The most reactive metal belongs to this group elements.
  • This is why it is nearly impossible to find them occurring alone in free state.
  • Some of the elements in this group are Li, Na, K, Rb, Cs and Fr.
  • Transition metals have variable oxidation states and some can be found alone in nature.
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An electron absorbs a photon of light energy and becomes energized; the electron shifts from a ____ atomic orbital to a ________
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Lower energy; higher energy
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A sample of a compound containing only carbon and hydrogen atoms is completely combusted, producing
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It’s the last one C2H
5 0
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Read 2 more answers
Pleaseeeeee helpppp with a right answer
andreev551 [17]
Answer is the last one, it will not ionize, it already has an octet of electrons in it's valance shell
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