Answer:
the protons
Explanation:
the number of protons is constant for each sample of the element. If the number of protons differs, then it is a different element.
The best and most correct answer among the choices provided by the question is the first choice "carbon has many allotropes"
Organic compound, any of a large class of chemical compounds in which one or more atoms of carbon<span> are covalently linked to atoms of other elements, most commonly </span>hydrogen<span>, </span>oxygen<span>, or </span>nitrogen. The few carbon-containing compounds not classified as organic include carbides, carbonates, and cyanides<span>.
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Answer:
1.87 J
Explanation:
q = c x m x (T2-T1)
c- specific heat of water (4.186 j/g.C)
q = 4.186 x 0.5137 x 0.871 = 1.87 J
Answer:
Explanation:
The unbalanced nuclear equation is
It is convenient to replace the question mark by an atomic symbol, 
, where x = the atomic number, y = the mass number, and Z = the symbol of the element .
Then your equation becomes
The main point to remember in balancing nuclear equations is that **the sums of the superscripts and the subscripts must be the same on each side of the equation**.
Then
84 = x + 2, so x = 84 - 2 = 82
210 = y + 4, so y = 206
Element 82 is lead, so the nuclear equation becomes
