Exam 22: The Main Group Elements Life and the Periodic Table

The first ionization energies of phosphorus and of sulfur are 1012 and 1000 kJ/mol.Why is IE₁ for S lower than that of P when the usual trend is for IE to increase across a row?

Neuron cells generate electrical signals by concentration gradients across membranes.Assuming a potassium ion concentration of 0.00300 M inside the cell and a concentration of 0.135 M outside the cell, what is the electrical potential across the cell membrane? Body temperature is 310 K.The sign identifies the change in the electrical potential across the membrane and which way the ions flow.

In comparison with their alcohol counterparts, thiols display characteristic odors.This is NOT due to which of the following factors?

Sodium is best described as a

Which halogen is a major essential element in the human body?

What is meant by volatile sulfur compound? Give an example.

Give an example of an alkali metal.

Which part of the body is the enhancement of MRI images using isotopes of noble gases most effective?

Which of the following is an alkali metal?

What is the charge on an alkali metal atom when it is in an ionic compound?

Arrange the following in order of increasing boiling point: Xe, Ar, Ne, F₂, and Br₂.

Give an example of a halogen.

Elements in group 17 (VIIA) are called

Main group or representative elements are NOT found in which of the following groups?

Which of the following is an essential element, but not a trace or ultratrace element?

What radiometric technique is used to produce images of the brain?

Essential elements

Identify which element, potassium or bromine, has the larger electron affinity and explain why.

The boiling point of H₂O is 100°C, while that of H₂S is -60°.This is due to

Urea is a waste product produced when the body metabolizes protein.What is the oxidation number of nitrogen in urea, (NH₂)₂CO?