changing the bonds changes the mass.
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Half life of a radio-active material is refereed to the time required for reducing its activity to 50 %.
Now, when I-131 passes 1st half life, it's activity will reduce to half i.e. 50%
When, I-131 passes 2nd half life, activity of I-131 will be reduced to 25%
On passing, 3rd half-life, percent activity of the I-131 <span>remaining will be 12.5 %.</span>
Answer:
A chemical bond formed when two atoms share two pairs of electrons is a<em> </em><em>d</em><em>o</em><em>u</em><em>b</em><em>l</em><em>e</em><em> </em>bond; it is best described as a <em>c</em><em>o</em><em>v</em><em>a</em><em>l</em><em>e</em><em>n</em><em>t</em><em> </em><em>b</em><em>o</em><em>n</em><em>d</em><em>.</em>
Explanation:
A chemical bond in which two pairs of electrons are shared has to be defined as covalent since ionic bonds don't involve electron sharing. They consist only of electrostatic attraction between ions.
Answer:
Explanation:
To find the number of moles of each element present in 1 mole of Be(OH)₂, we use the ratio of the molar masses of the elements to the compound and multiply by the given mole.
Molar mass of Be(OH)₂ = 9 + 2(16+1) = 43g/mol
number of moles of Be =
x 1 = 0.209mole
number of moles of O =
x 1 = 0.744mole
number of moles of H =
x 1 = 0.047mole