Atoms of which element have the most valence electrons?

A. Silicon (Si)

B. Calcium (Ca)

C. Aluminum (Al)

D. Sodium (Na)

What is the effective nuclear charger of an electron in a 5p orbital of iodine when the shielding parameter is equal to 48

A 10.0-mL solution of 0.30 M NH3 is titrated with a 0.100 M HCl solution. Calculate the pH after the following additions of the HCl solution: a) 0.00 mL b) 10.0 mL c) 30.0 mL d) 40.0 mL

What is the best description of the energy stored in a stretched or compressed object.

How can we remove the hardness of water by boiling?

Cutting a forest destroys habitats and can lead to soil erosion

An element consists of two isotopes. One with a mass of 79.95 amu and an abundance of 29.9%. The second isotope has a mass of 81.95 amu with an abundance of 70.1%. What is the molar mass of this element?

Write a short paragraph using the terms static electricity and electric discharge

Question 10 A 75.0 - mL sample of 1.54*10-2 M Na2SO4 (aq) is added to 75.0 mL of 1.22*10-2 M Ca (NO3) 2 (aq). Part A What percentage of the Ca2 + remains unprecipitated? Express your answer using two significant figures.

How many milliliters of 0.50 M KOH are needed to exactly neutralize 10 milliliters of of 1.5 M HNO3 A. 5.0 mL B. 12 mL C. 25 mL D. 30 mL

What type of bond holds amino acids together?