11 12 Na Mg 13 14 15 16 17 18 Al Si Ar 4 Ca Sc Ti Cr Mn Fe Co Ni Se Br Kr 37 30 39 41 42 43 44 45 46 47 40 49 50 51 52 53 54 5 6 Cs Ba H Ta W Re Os r Pt Au Hg TI Pb B Po At Rn 7 35 36 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 105 106 Bh Hs Mt Ds Rg Cn Uus LV Uus Uue Lanthanides B & 2 Nd Pm Sm fu ad to by ho f Actinides 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 1. How many elements are currently recognized in the periodic table? 2. What is the atomic number of helium (He). 3. How many elements are in the first period of the periodic table?. 4. What is the symbol and atomic number of the element with 26 protons?, 5. How many valence electrons does carbon (C) have?, 6. Which element has the symbol "Na" and atomic number 113. 7. How many groups are there in the periodic table?_ 8. Calculate the average atomic mass of an element with two isotopes: one with a mass of 10 amu and abundance of 80%, and another with a mass of 12 amu and abundance of 20%. 9. Which element has the highest electronegativity value? 10. What is the electron configuration of nitrogen (N)

Question

11 12 Na Mg 13 14 15 16 17 18 Al Si Ar 4 Ca Sc Ti Cr Mn Fe Co Ni Se Br Kr 37 30 39 41 42 43 44 45 46 47 40 49 50 51 52 53 54 5 6 Cs Ba H Ta W Re Os r Pt Au Hg TI Pb B Po At Rn 7 35 36 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 105 106 Bh Hs Mt Ds Rg Cn Uus LV Uus Uue Lanthanides B &amp; 2 Nd Pm Sm fu ad to by ho f Actinides 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 1. How many elements are currently recognized in the periodic table? 2. What is the atomic number of helium (He). 3. How many elements are in the first period of the periodic table?. 4. What is the symbol and atomic number of the element with 26 protons?, 5. How many valence electrons does carbon (C) have?, 6. Which element has the symbol "Na" and atomic number 113. 7. How many groups are there in the periodic table?_ 8. Calculate the average atomic mass of an element with two isotopes: one with a mass of 10 amu and abundance of 80%, and another with a mass of 12 amu and abundance of 20%. 9. Which element has the highest electronegativity value? 10. What is the electron configuration of nitrogen (N)​

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