1) The blue planet is ..... a) Neptune b) Mars c) Mercury 2) 2- The planet of life is ... a) Mars b) Jupiter c) Earth 3) 3 -The red planet is .... a) Mars b) Saturn c) Mercury 4) The closest planet to the sun a) Neptune b) Venus c) Mercury 5) The atomic number of H gas which contains 1 proton is ................... a) 1 b) 0 c) 2 6) which of the following subatomic components has a mass of 1 u ?? a) protons only b) electrons only c) proton and neutron 7) The positive charged particles found inside the nucleus is ........................ a) electron b) proton c) neutron

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