What type of forces affects the speed and direction of motion of an object? a: balanced forces b: unbalanced forces c: equal and opposite forces in the vertical plane d: equal and opposite forces in the horizontal plane

The correct Answer Is B

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

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since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

a) the particles of the chair are strongly held together.