Answer:
33
Explanation:
bromine has 35 electrons . But if it has a plus 2 charge instead of adding 2 electrons you would subtract. it is opposite. so it would have 33 electrons .
Answer:
<em>think</em><em> </em><em>it's</em><em> </em><em>B</em>
Explanation:
Gravity is a force of attraction that exists between any two masses, any two bodies, any two particles. Gravity is not just the attraction between objects and the Earth. It is an attraction that exists between all objects, everywhere in the universe.
<em>H</em><em>o</em><em>p</em><em>e</em><em> </em><em>it'll</em><em> </em><em>help</em><em>!</em>
<em>s</em><em>t</em><em>a</em><em>y</em><em> </em><em>safe</em><em>:</em><em>)</em><em> </em><em>^</em><em>-</em><em>^</em>
Approximately .
The relative atomic weight of an element is a weighted average of the atomic mass for all its isotopes. It accounts for the atomic mass for each isotope, as well the relative abundance of each.
The question provides no detailed data on the relative mass for each isotope atom. Each nucleon- proton or neutron- has a mass of approximately . The mass number of an atom gives the total number of nucleons it contains. The mass number can, therefore, serve as a numerical estimator for the relative atomic mass of an isotope. That is:
- Copper-63 has mass number 63 and a relative atomic mass of approximately ;
- Copper-65 has mass number 65 and a relative atomic mass of approximately
Copper-63 has an abundance of 69.17% relative to all copper atoms. Similarly, copper-65 has a relative abundance of 30.83%. Therefore, one would expect to find 6,917 copper-63 atoms and 3,083 copper-65 atoms in a sample of 10,000 copper atoms. Similarly, 10,000 <em>moles</em> or 10,000 × (6.02 × 10²³) copper atoms would contain 6,917 <em>moles</em> of copper-63 atoms and 3,083 <em>moles</em> of copper-65 atoms.
10,000 moles of copper atoms would have a mass of approximately
.
Each mole of copper atoms would thus have a mass of approximately
.
Combining the two previous steps would give:
,
which essentially multiplies the relative atomic mass by their relative abundance, and takes the sum of the products.
The relative atomic mass of an element is measured in grams per mole. One mole of copper atoms have a mass of 63.62 grams. Copper thus has a relative atomic mass of .
Answer:
-3.82ºC is the freezing point of solution
Explanation:
We work with the Freezing point depression to solve the problem
ΔT = m . Kf . i
ΔT = Freezing point of pure solvent - freezing point of solution
Let's find out m, molality (moles of solute in 1kg of solvent)
15 g / 58.45 g/mol = 0.257 moles of NaCl
NaCl(s) → Na⁺ (aq) + Cl⁻(aq)
i = 2 (Van't Hoff factor, numbers of ions dissolved)
m = mol /kg → 0.257 mol / 0.250kg = 1.03 m
Kf = Cryoscopic constant → 1.86 ºC/m (pure, for water)
0ºC - Tºf = 1.03m . 1.86ºC/m . 2
Tºf = -3.82ºC
Answer:
<em>Chemical</em><em> </em><em>properties</em><em> </em><em>of </em><em>each </em><em>elements </em><em>are </em><em>determined</em><em> </em><em>as </em><em>the </em><em>elements</em><em> </em><em>of </em><em>the </em><em>el</em><em>e</em><em>ctronic </em><em>conf</em><em>i</em><em>guration </em><em>and </em><em>particularly</em><em> </em><em>by </em><em>its </em><em>outermost </em><em>valence </em><em>electrons </em><em>in </em><em>addition</em><em> </em><em>the </em><em>total </em><em>number</em><em> </em><em>of </em><em>electron</em><em> </em><em>shells </em><em>an </em><em>atom </em><em>determines </em><em>to </em><em>which </em><em>per</em><em>i</em><em>od </em><em>it </em><em>belongs</em><em> </em><em>to </em><em>.</em>
<em><u>maybe </u></em><em><u>this </u></em><em><u>might </u></em><em><u>help </u></em><em><u>u</u></em>