What is the number of valence electrons in an atom of Al?

a. 13

b. 3

c. 10

d. 8

The amino acid Prolinehas a pk1 of 1.99, pk2 of 10.60. The amino acid Serine has pk1 of 2.21 and a of pk2 of 9.15. If these two amino acids bind together by peptide bond creating the peptide sequence Pro-Ser.

How many moles are in 1.50x10^23 molecules of NH3

Which statement describes the electron sea model for metallic bonding? -This model involves electrons held tightly between atoms. -This model explains all properties of metals. -This model involves electrons moving among bands of orbitals.

An electron in an atom is known to be in a state with magnetic quantum number ml=0. What is the smallest possible value of the principal quantum number of the state?

What is difference between organic chemistry nd inorganic chemistry?

Making observations is the first step in the scientific method. Why don't scientists stop with the first step when creating an experiment? A.

Brass is an example of

A molecule has four bonded atoms around a central atom. The central atom does not have any lone pairs of electrons. What is the geometry of the molecule? Bent Linear Trigonal planar Tetrahedral

Using the periodic tables, identify the heaviest member of each of the following groups: (a) alkali metals (b) chalcogens (c) noble gases (d) alkaline earth metals

Select the best answer for the question. 13. Which statement accurately describes the relationship between mass and weight? A. An object with twice the mass of another object will weigh twice as much B.