HCIO4 is a stronger acid than HCIO because as the number of oxygen increases the oxidation number in the central atom increases which weakens the O-H bond strength and increases the acidity.
The accuracy of a series of measurements is best understood by looking at the known value.
The values obtained in a series of measurement can be precise or accurate.
The precision of the measurement is obtained by looking at the trend of the values obtained.
- If the values are close to each other, the measurement is precise but if the values are far from each other, the measurement is not precise.
The accuracy of a measurement is determine by comparing the determine value against a known value.
- If the measured value is close to a <em>known value</em>, then the measurement is accurate, but if the measured value is from from a known value then the measurement is not accurate.
Thus, the accuracy of a series of measurements is best understood by looking at the known value.
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Answer: Resistance is the ratio of potential difference to the current.
Explanation: In electronics, resistance is defined as the obstruction in the path of current flowing in a circuit.
According to the Ohm's law the relation between resistance, current and potential difference is expressed as:
Voltage drop across the terminals of a circuit = Current flowing in the circuit 
resistance offered by the circuit.
V = I R
Here V is in Volts
I is in Ampere
R is in Ohms
So, resistance can be defined as the ratio of potential difference to the current.
Energy and the unit of measurement is in joules
Answer:
Na sodium
Mg magnesium
Be beryllium
Explanation:
Nel is not any element it is wrong
