Identify by Number (1A-8A) the Main-Group of the Periodic Table

question 26

Essay

Identify by number (1A-8A) the main-group of the periodic table to which the described element (X) belongs, in each of the following cases.
a. X commonly forms the ion X^2-.
b. X reacts with water according to the equation
X(s) + 2H₂O(l)  X(OH)₂(aq) + H₂(g)
c. X exists as molecules, X₂; its hydride has the formula HX.
d. X is a metal which reacts with oxygen to produce the peroxide, X₂O₂.

Realize the inherent uncertainty in verifying the true nature of the null hypothesis in empirical research.

Recognize the challenges and limitations in completely controlling for external variables in research studies.

Understand the concept and use of z scores in statistical analysis.

Comprehend the properties and characteristics of the normal curve.

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