How many electrons are in the outermost energy shell of a calcium atom

Jane described two substances which participate in photosynthesis. Substance A: Combines with water Substance B: Gaseous product formed Which statement is correct? Substance A is chlorophyll and Substance B is oxygen.

An aqueous solution contains 300 parts per million of KOH. Determine the number of grams of KOH present in 1000 grams of this soulution

Which of these phenomena cause uneven heating of the Earth? a. Land and water have different heat capacities. b. Land and water have the same rate of heat absorption. c. The angle of incoming sunlight varies at different places. d.

Design a synthesis of 2-bromo-1-chloro-4-nitrobenzene from benzene or any mono-substituted benzene. Part 1 out of 6 choose the best option for the immediate precursor to the target molecule.

What is the molarity of an acid that is made up of 9.5 moles of HCl dissolved in 1:24 L of water?

When a solution of LiC2H3O2 reacts with a solution of MgSO4, what is the net ionic equation? No reaction Mg+2 (aq) + C2H3O2 - (aq) → Mg (C2H3O2) 2 (s) Mg+2 (aq) + 2C2H3O2 - (aq) → Mg (C2H3O2) 2 (s) 2Li + (aq) + SO4-2 (aq) → Li2SO4 (s)

What are the relations between Electrochemistry and Cancer?

Which of the following are sources of low-level radiation? A) medical X-rays B) nuclear weapons testing C) buring of fossil fuels D) all of the above E) a and c only

How does the nucleus of an atom change after beta decay? a. The nucleus remains the same b. The nucleus gains an electron. (c.) The nucleus loses a neutron. d. The nucleus loses a proton

Calculate Zeff for the 4s electron in a copper Cu