e) -2 lulalls 2 electrons to form an ion. The charge on the ion is (a) +2 (b)-2
ID: 1089475 • Letter: E
Question
e) -2 lulalls 2 electrons to form an ion. The charge on the ion is (a) +2 (b)-2 (c)-1 (d)+1 (e)0 17, Fill in the blanks. Isotopes of nitrogen have the same number of (a) neutrons, electrons (b) protons, neutrons(c) protons, electrons (d) neutrons, protons 18. Which of the following is a nonmetal? (a) Co (b) Ca (c) CI (d) Cu(e) Cr -but different numbers of 19. Which of the following is a metalloid? (a) sodium (b) selenium (c) silicon (d) sulfur (e) scandium 20. Which of the following is an empirical formula? (a) H,02 21. Rutherford's gold foil experiment proved (a) Thompson plum pudding was corect (o) atom's positive charge is concentrated at the nucleus (c) mass (b) CH2 (c) CHe (d) CHOejCO f an electron is larger than mass of a proton (d) nucleus contains neutrons (e) Nothing of the following elements is chemically most simillar to magnesium? (a)Ar (b) Li (N (d) Ca (e)A in Kelvin. (a) 103 (b) 138 (c) 166 ()248(e) 298 23. A temperature of 25°C is 24. The name of Al(CN)3 is (a) ammonium cyanide (b) aluminum carbon nitride (c) aluminum cyanide 25. The correct formula for iron (l1) phosphate is (a) FezPOs (b) Fes/PO42 (c) Fe/PO)(d) FesPExplanation / Answer
17. (b) protons, neutron.
Isotope of any element always has same no. Of protons but different no. Of neutron.
18. (C) Cl
Rest of all are metals because Ca is a alkaline earth metal while Co, Cr and Cu are d block element. d block elements are well known for mettalic character.
19. (C) silicon.
Metalloids are borderline elements which are showing the metallic and nonmetallic character rest of all are metal except sulphur.
21. (b) atoms positive charge is concentrated at the nucleus.
In the result of Rutherford model he concluded that some positive charge VB is available in the nucleus which made alpha particles to move away or reflect back.
22. (d) Ca
It is the only element which is belonging tftom the same group of magnesium in all the provided options. All elements of the same group will mostly show the similar chemical properties.
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