Which of the following correctly describes the relationship between speed and velocity?

Speed and velocity is a scalar and vector quantity of a similar parameter, respectively. They both refer to how fast an object moves. However, the speed only has to do with the magnitude. The velocity takes into account the sign which indicates the direction of the movement. For example, the value is -5 m/s. The speed is 5 m/s, but the velocity is 5 m/s moving downwards because the negative sign denotes downward movement or movement to the left.

The question is incomplete, here is the complete question:

Two atoms interact with each other as shown by the equation. Complete the equation by filling in the missing parts.

The isotopic symbol of the missing part is

Explanation:

In a nuclear reaction, the total mass and total atomic number remains the same.

For the given fusion reaction:

To calculate A:

Total mass on reactant side = total mass on product side

2 + 2 = A + 1

A = 3

To calculate Z:

Total atomic number on reactant side = total atomic number on product side

1 + 1 = Z

Z = 2

Hence, the isotopic symbol of the missing part is