Atomic Number Success: Practice & Learn Here!

Which of the following is a mineral?
Steel
Bauxite
Lithium
Potash
Zinc
Gold

isidoreeojj 2022-11-29

At what temperature will He atoms have the same Crms value as N2 molecules at 25 degrees Celsius? Solve this problem without calculating the value of Crms for N2. Crms is the root mean square speed.

Cherish Rivera 2022-11-27

How do you find the number of protons, electrons, and neutrons of a particular atom, if all you are given is the atomic number and mass number?

Cassius Delacruz 2022-11-27

Atoms have no electric charge because they
A. Have an equal number of charged and non charged particles.
B. Have neutrons in their nuclei.
C. Have an equal number of electrons and protons
D. Have an equal number of neutrons and protons

Dayanara Nash 2022-11-26

The atomic mass of an element is equal to the ________ of an atom in the atomic mass unit.

SadoHearcepar2BH 2022-11-25

If the atomic mass of an element is x, what is the mass in grams of $6.02 \times 1023$ atoms of the element?

VarceprewN3M 2022-11-25

Earth has a magnetic dipole moment of
$8.0 \times 10^{22} J / T$
(a) What current would have to be produced in a single turn of wire extending around Earth at its geomagnetic equator if we wished to set up such a dipole? Could such an arrangement be used to cancel out Earth’s magnetism
(b) at points in space well above Earth’s surface or
(c) on Earth’s surface?

BertonCO5 2022-11-24

There is no particle of matter smaller than an atom.
A.True
B.False

SevcamXnr 2022-11-24

Find the net charge of a system consisting of 206 electrons and 161 protons. Express your answer using two significant figures.

Belinda Colon 2022-11-24

Evaluating $\int_{0}^{\infty} \frac{\ln x}{x^{2} + 2 x + 2} d x$
I tried to use completing the square and use the answers in the linked question but since the log term in the numerator has $x$ not $x + 1$ (after completing the square the quadratic is $(x + 1)^{2} + 1$ ) so that doesn't seem to work.

umthumaL3e 2022-11-23

An atom with 3 protons and 4 neutrons have a valency of?

Rigoberto Drake 2022-11-20

As total number of nucleons in nucleus is equal to mass number. And is also called atomic mass number. I want to know that is there any difference between the two? Because in nuclear reactions mass number differs from atomic mass and the difference between two provides binding energy.

Taylor Barron 2022-11-04

Why is an electron in a radioactive decay indicated with a '-1' where the atomic number should be.
In the balanced equations of any radioactive decay every atom is represented as $_{y}^{x} Z$
Wherever an electronic is emitted the 'x' position is indicated by -1 and thus the atomic numbers balance.
But it never made sense to me why. I even tried googling but couldn't find what I needed.
Below is one such reaction for an example: $_{88}^{228} R a ⟶_{89}^{228} A c +_{- 1}^{0} e$

Kailyn Hamilton 2022-11-02

Why does a beta particle have 0 as its mass number?
For a negative beta particle why is it that its mass number is 0 and its atomic number is -1 because if : mass number = num of (protons + neutrons) and atomic number= num of (protons) , why wouldn't the mass number be -1 aswell , I know the mass of an electron is 0 but if protons make up the mass and atomic numbers then why is just the atomic number -1?

Kayla Mcdowell 2022-10-17

Why binding energy per nucleon is constant(pratically) for atomic number, A, larger than 30 and less than 170, and explain the saturation property of nuclear forces with analogy that is easy to understand?

Jairo Decker 2022-10-16

The mean momentum $p$ of a nucleon in a nucleus of the mass number $A$ and atomic number $Z$ depends on $A$ as
$P \propto A^{- \frac{1}{3}} .$
All that I know is that the radius of the nucleus is proportional to mass number as
$R \propto A^{\frac{1}{3}} .$
From here how can one relate momentum to the mass number?

Emilio Calhoun 2022-10-15

Why does velocity of electron increases with increase atomic number in the Bohr model of the hydrogen and hydrogen like atoms?

Kymani Hatfield 2022-10-15

If I have the fission of U-235 and I know that one of the products is Cs-137, is there a way of figuring out the other product? Should there be multiple possibilities?

raapjeqp 2022-10-13

Let us think of a covalent bond between two atoms $A$ and $B$ . Since in covalent bond,sharing of electrons take place, valence eletrons of one atom behave as the electrons of the other atom. So since $A$ gets $B$ 's share of electrons, it's electron number has increased more than before. If the atomic number of $A$ is $x$ ,now proton number of $A$ is $x$ and electron number is $x +$ something,so number of electron is more than proton and as such w.r.t $A$ , $A$ develops negative charge. Similarly $B$ develops negative charge. But we know there is no charge formed in covalent bond. So where is my misconception?

Krish Schmitt 2022-09-30

Mercury has a very large surface tension, but what causes this? Is that caused by the van der Waals forces because it has an high atomic number whereby there are a lot of electrons which makes mercury a kind op dipole because electrons are less binded to the core? Or are there other reasons? If not how does this metal compare to other heavy metals like gold?
And is this the same reason as why mercury is liquid at room temperature?

Atomic number is an important concept in chemistry and physics. It represents the number of protons in an atom's nucleus. This number determines the element's identity and the number of electrons it has. Atomic numbers are part of the Periodic Table of Elements, and each element has a unique atomic number. Atomic numbers are also used to describe isotopes, which are atoms of the same element but have different numbers of neutrons. Knowing the atomic number of an element helps in understanding its chemical and physical properties. Atoms with the same atomic number but different numbers of neutrons are called isotopes, and they have different properties. Understanding atomic number is essential for understanding and mastering chemistry and physics.

Nuclear physics

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