C2H5OH(I) +3 O2(g) → 2 C02(g) + 3 H2O(1) deltaH = -1370 kJ/mol rxn (C) Based on the information above, identify the deltaH values that should be added together to determine the value of deltaHrxn for the following reaction.
C2H4(g) + H2O(l) → C2H5OH(l)

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

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each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.