The answer is 10%
The percent error is used to determine the precision of calculations. It can be expressed as:

where:
e - the percent error,
v - experimental value (measured value),
v₁ - theoretical value,
It is given:
e = ?
v = 88 calories
v₁ = 80 calories
Thus, the percent error is:
The distance between (–6, 2) and (8, 10) on a coordinate grid is 8.246
Certain naturally occurring radioactive isotopes are unstable: Their nucleus breaks apart, undergoing nuclear decay. ... All elements with 84 or more protons are unstable; they eventually undergo decay. Other isotopes with fewer protons in their nucleus are also radioactive.
The model of the atom has dramatically changed over many many years.We learned atoms make up different substances and are the smallest particles of matter, which have subatomic particles that are very small portions of matter. At first scientist only thought there were electrons which are negatively charged.
Answer:
1 only
Explanation:
a compound is a mix of two different elements, two of the same element is just a molecule