The unknown metal with a mass of 39.27 g is potassium with the symbol K.
The mass of an atom is due to protons and neutrons present in it.
The protons and neutrons are together present in the nucleus of an atom.
The mass of any element is given by its mass number whose formula is
Mass Number = Number of protons + Number of neutrons
In the given case 39 = Number of protons + Number of neutrons
The only element of the periodic table which satisfies the above equation is potassium because it has 19 protons and 20 neutrons.
Thus, the unknown metal with a mass of 39.27 g is potassium with the symbol K.
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B AND C I THINK I TOOK THIS ALREADY MS
When it's filled, the mass of the tank itself is still 2.43 kg. The other 51.77 kg of mass must be the water in it.
Answer:
1st choice is the true
cause Science and technology are Related Improvement in science is improvement in technology
The motion of the branch being shaken causes the fruit to detach off the branch, and gravity helps make the fruit fall.