How do you find the atomic number of a atom?

Physics

2 answers:

Vlada [557]3 years ago

6 0

Answer: To find the atomic mass of an atom of an element, add up the mass of protons and neutrons.

Explanation: Find the atomic mass of an isotope of carbon that has 7 neutrons. You can see from the periodic table that carbon has an atomic number of 6, which is its number of protons.

Sunny_sXe [5.5K]3 years ago

5 0

Answer :

The number of protons in the nucleus determines the atomic number.

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The displacement (in meters) of a particle moving in a straight line is given by the equation of motion:

lutik1710 [3]

Answer:

At $t = 1\; \rm s$ , the particle should have a velocity of $-8\; \rm m \cdot s^{-1}$ .
At $t = 2\; \rm s$ , the particle should have a velocity of $-1\; \rm m \cdot s^{-1}$ .
At $t = 3\; \rm s$ , the particle should have a velocity of $\displaystyle -\frac{8}{27}\; \rm m \cdot s^{-1}$ .

For $a > 0$ , at $t = a \; \text{second}$ , the particle should have a velocity of $\displaystyle -\frac{8}{a^3}\; \rm m \cdot s^{-1}$ .

Explanation:

Differentiate the displacement of an object (with respect to time) to find the object's velocity.

Note that the in this question, the expression for displacement is undefined (and not differentiable) when $t$ is equal to zero. For $t > 0$ :

$\begin{aligned}v &= \frac{\rm d}{{\rm d}t}\, [s] = \frac{\rm d}{{\rm d}t}\, \left[\frac{4}{t^2}\right] \\ &= \frac{\rm d}{{\rm d}t}\, \left[4\, t^{-2}\right] = 4\, \left((-2)\, t^{-3}\right) = -8\, t^{-3} =-\frac{8}{t^3}\end{aligned}$ .