2 years ago

Which two elements have the same number of valence electrons? pls help 50 points

1 answer:

5 0

Answer: All elements in the same group (column) on the periodic table will have the same number of valence electrons.

Explanation:

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3 years ago

Anna71 [15]

Answer:

Mass of the man = 100 kg

Explanation:

Given that,

Mass of the Earth, M = 6×10²⁴ kg

The radius of the Earth, r = 6400 km

Force on man, F = 977 N

We need to find the mass of the man. Let the mass of the man be m. The gravitational force acting between two objects is given by :

$F=G\dfrac{mM}{r^2}\\\\m=\dfrac{Fr^2}{GM}\\\\m=\dfrac{977\times (6400\times 10^3)^2}{6.67\times 10^{-11}\times 6\times 10^{24}}\\\\m=99.99\ kg$

m = 100 kg

So, the mass of the man is 100 kg.

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2 years ago