Be, Mg Ca, Sr ,Ba ,Ra are the elements which belongs to 2nd group in the periodic table.
So answer is
Calcium (Ca)
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Which of the following is in the same group as magnesium (Mg)? Osodium (Na) O tungsten...
Which element(s) is (are) alkali metals? Mg , Na , Ne , P , Xe , Rb , Th , O , Fe , Ca , Nb
QUESTION 16 The Al for sodium is: O 3.500 mg O b. 1500 mg ADOR O C2000 mg O d. 2500 mg No tolerable upper intake level has been established for chromium. True False The Al for sodium is: O a. 500 mg b. 1500 mg OC. 2000 mg O d. 2500 mg Which of the following minerals acts as a disinfectant in the body? O a. Calcium O b. Cholride O C. Flouride O d. Sulfur Adequate intake of...
Which of the following atoms would have the largest second ionization energy? Mg Cl Na Ca S Which of the following electron configurations is different from that expected? Cr Ca Ti V Sc
the hardness of water causes the disolved Ca+2 ion form magnesium carbonate, Mg CO3 which is slightly doluble solids. soaking solid magnesium carbonate in water only yeilds small amounts of free calcium ion that can be captured but still solvated using a chelating milecule called Ethylendiamineteraacetic acid or EDTA. the 2 reactions involved: 1- Mg CO3 ➡ Mg^+2 + CO^-2 keq= 6.8×10^-6 2- Mg^+2 + EDTA ^-4 ➡ MgEDTA ^-2 + CO ^-2 keq= 4.90×10^8 these reactions combine to give...
. 5 points. Using Eq. 4-17 (shown below) calculate the dose of calcium hydroxide in mg Ca(OH)2/L needed to remove the magnesium in a water containing 124 mg MgCl2/L. Ignore subsequent soda ash requirements to remove the added calcium Hint: use one mole of lime per mole of magnesium. Note: this is non-carbonate hardness . 5 points. Briefly explain the formation of "soap scum" in terms of the chemical elements in hard water and "natural" soap. Ca2* Na2CO3 CaCO3(s)2 Na*...
QUESTION 40 Which of the following elements is chemically similar to magnesium? sulfur O potassium calcium nickel Iron
7.90 Rank the following elements in order of increasing ionization energy: Mg, P. O. 7.91 Use electron configurations to explain why more energy is required to remove an electron from a lithium atom than from a sodium atom. 7.93 Use electron configurations to explain why the ionization energy for fluorine is greater than that for oxygen. 7.95 Write balanced equations that represent the processes that correspond to the first and second ionization energies for magnesium. 7.96 Which ionization energy (IE....
Mg-24 is a nonradioactive isotope of magnesium and Mg-27 is a radioactive isotope. Which of the following is a true statement concerning these two isotopes?
Which of the following two atoms are isotopes? o Mg and Ic o ci and Br o Ar and ca o PC and pc
Question 5 [11 marks] A seawater which serves as a useful commercial source of magnesium compounds contains a magnesium ion concentration of 0.054 mol dm? The magnesium is precipitated from solution by adding calcium hydroxide. Mg2+ (aq) + Ca(OH)2 (s) → Ca2+(aq) + Mg(OH)2 (s) a) Write an expression for the Ksp of Mg(OH)2, including its units. [3] b) [2] ) The numerical value for Ks is 2.00 x 10-11. Calculate [Mg2+ (aq)] in a saturated solution of Mg(OH)2. Hence...