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An element has three naturally occurring isotopes with the following masses and abundances. How do you calculate the atomic mass of this element? What is the identity of the element?
The atomic mass is the weighted average of the atomic masses of each isotope. In a weighted average, we multiply each value by a number representing its relative importance. In...
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What the symbol for an element that is an alkaline earth metal?
The alkaline earth metals are found in the second column of : Be (beryllium), Mg (magnesium), Ca (calcium), Sr (strontium), Ba (barium) and Ra (radium). All the alkaline earth metals...
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The atomic mass of element A is 63.6 atomic mass units. The only naturally occurring isotopes of element A are A-63 and A-65. What is the percent abundance in a naturally occurring sample of element A closest to?
The average isotopic mass is the weighted average of the mass of the individual . Because the quoted average, $63.6$ $"amu"$, is closer to $""^63A$ than $""^65A$, the $""^63A$...
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Suppose element X is a poor conductor of electricity and breaks when hit with a hammer. Element Z is a good conductor of electricity and heat. In what area of the periodic table does each element most likely belong?
Metals are good conductors of electricity and heat. the text doesen't tell anymore and Z may be one of abaut 90 known metals, in the left area of . X,...
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In the ground state, each atom of an element has two valence electrons. This element has a lower first ionization energy than calcium. Where is this element located on the Periodic Table?
It is a period or row that is energy level five or more, below calcium on . Two valence electrons places the element in the alkaline earth family or...
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Which alkali metal element is the most reactive?
Both of these metals are the heaviest alkali metals. The higher molecular mass metals are not available in quantity, and are quite expensive. Sodium and lithium are generally available in...
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Which element is an alkali metal: Rubidium or Aluminum?
Rb is in Group I. Al is in Group III.
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Do ionic bonds occur between metal and non-metal ions, non-metal and non-metal ions, or metal and metal ions?
Ionic bonds occur between anions and cations. And cations may be metallic, i.e., $M^(2+)$, or they may be non-metallic, i.e. ammonium salts, $NH_4^+$. And anions, while typically non-metallic, i.e. $X^-$...
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A particular element is located in column IVA of the periodic table. How many dots would be placed around the symbol of this element in its electron dot notation?
Column IVA is group 14 on . The in group 14 all have 4 , so the Lewis symbol for elements in this group have 4 dots around them (each...
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A compound is broken down into 34.5 g of element A, 18.2 g of element B, and 2.6 g of element C. What is the percent (by mass) of each element?
$%A$ $=$ $(34.5*g)/(34.5*g+18.2*g+2.6*g)xx100%=62.3%$ $%B$ $=$ $(18.2*g)/(34.5*g+18.2*g+2.6*g)xx100%=33.0%$ $%C$ $=$ $(2.6*g)/(34.5*g+18.2*g+2.6*g)xx100%=4.70%$ That is $%" element"$ $=$ $"Mass of element"/"Mass of compound"xx100%$ $"Mass of compound"$ is clearly the SUM of the constituent ....
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