Statements (iii) and (iv) are correct. At the highest peak, vertical velocity momentarily becomes zero making kinetic energy zero, while the entire initial mechanical energy turns into maximum gravitational potential energy at that height.
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The correct filled terms are force and displacement for part one, one for part two, half m v square for part three, m g h for part four and rate for part five respectively.
Statements (ii), (iii) and (v) are True, while (i) and (iv) are False. Work requires displacement and a motionless stretched rubber band stores potential energy rather than possessing kinetic energy due to lack of motion.
Atomic number stays 12 since proton count is unchanged. Atomic mass increases slightly because the orbiting particles are heavier. Mass number remains 24 since nuclear nucleons are unchanged. Overall charge remains zero.
Element X has 17 protons, 17 electrons, atomic number 17, representing chlorine with electronic configuration 2, 8, 7 and seven valence electrons. Adding two neutrons raises mass number to 37, forming its isotope.