Assume that an object has been placed in the pan of a triple beam balance. The scales of the balance are shown below. What is the mass of the object?

190.4 g

Explanation:

To obtain the mass of the object, we must be able to obtain the reading of the triple beam balance.

Thus, the reading of the balance can be obtained by simply adding the various values as indicated by the pointer in each scale.

This can be obtained as follow:

Scale 1 = 90 g

Scale 2 = 100 g

Scale 3 = 0.4 g

Reading of the balance = Scale 1 + Scale 2 + Scale 3

Reading of the balance = 90 + 100 + 0.4

Reading of the balance = 190.4 g

Thus, the mass of the object as indicated by the triple beam balance is 190.4 g.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

i think so it’s will be b yes i believe its