An element's atomic number is the A. weight of the atom.
B. sum of the protons and neutrons in an atom.
C. number of protons in an atom's nucleus.
D. mass of the atom

Answers

Answer 1

Answer:

Answer:

C. number of protons in an atom's nucleus.

Explanation:

Atomic number : It is defined as the number of electrons or number of protons present in a neutral atom.

However, when we talk about the atomic number of the ion, it is not equal to the number of electrons as electron can be gained or loosed.

This is why, more appropriately, the number of the protons which are present in the nucleus of the atom is called the atomic number.

For example, Sodium has 11 protons in its nucleus which suggest that the atomic number of sodium is 11.

Answer 2

Answer: C. the number of protons in nucleus

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What is the empirical formula for a compound if a sample contains 3.72g of P and 21.28g of Cl?

The smallest unit into which a compound can be divided and still be that same compound is a(n) ___.

Answers

The molecule of that compound! Hope this helps!

Answer:

The molecule of that compound.

Explanation:

How does chlorine react with ethene?By substituting hydrogen with chlorine.
By breaking a carbon double bond and adding chlorine.
By removing hydrogen because of chlorine’s attraction to hydrogen’s nucleus.
Chlorine and ethene do not react spontaneously.

Answers

Answer : Option B) By breaking a carbon double bond and adding chlorine.

Explanation : When chlorine reacts with ethene it forms dicholoroethane. It reacts spontaneously to form product. The halogenation reaction takes place in ethene across the double bonds and removes the hydrogen from ethene and two chlorine atoms gets attached in their place; which results in dichloroethane as the product.

Answer: option B m

Explanation:

It is an example for Electrophilic Addition of Halogen. And addition of Cl2 to Alkene is always Trans Addition. That means both cl atoms should add opposite side of double bond and results vicinal 1,2-dichloroethane as a product.

CH2=CH2 + Cl2-------> ClCH2CH2Cl

Name the two common secondary structures that polypeptide sheets fold into.

Answers

I think it’s the alpha-helix and the beta-pleated sheet

1. Why do all atoms of an element have the same atomic number, although they may have different mass numbers?2. What do we call atoms of the same element with different mass numbers?

3. Explain the meaning of each term in the symbol
(AZ)X

Answers

Atoms of an element have the same atomic number but different mass numbers because the atomic number only contains the amount of protons in an element.
Atoms of the same element that have different mass numbers are called isotopes.
With (AZ)X, the A is the number of protons, the Z is the number of neutrons, and the X is the electrons.

Chuck wants to know how many electrons in an atom are not paired up. Which model would be best for Chuck to writeout?
a set of quantum numbers for the last electron in the atom
a configuration with numbers, letters, and superscripts
a dot structure of the atom
an orbital notation of the atom

Answers

Answer:

D. an orbital notation of the atom

Explanation:

Orbital notiation uses lines and arrows to show shells, subshells, and orbitals for electrons in an atom. Since it shows arrows being paired up in this diagram it would be the best model for Chuck to use.

On Edgenuity2020, the answer is D) an orbital notation of the atom

Use the periodic table to find the charge of the ion that each atom is most likely to form. The charge of a sulfur (S) ion is The charge of a potassium (K) ion is The charge of a boron (B) ion is The charge of an iodine (I) ion is The charge of a bromine (Br) ion is

Answers

Final answer:

The charges of ions that Sulfur (S), Potassium (K), Boron (B), Iodine (I), and Bromine (Br) are most likely to form are -2, +1, +3, -1, and -1, respectively. This is determined by their positions on the periodic table.

Explanation:

The charge of an ion that a certain atom is most likely to form is dependent on its position on the periodic table. Elements on the left side of the periodic table (like potassium) tend to lose electrons and form positive ions, while elements on the right side (like sulfur, iodine, bromine) tend to gain electrons and form negative ions.

The charge of a sulfur (S) ion is usually -2 because sulfur, being in Group 16, tends to gain two electrons to reach a stable electronic configuration. The charge of a potassium (K) ion is usually +1. This is because potassium, which is in Group 1, usually loses one electron to achieve a stable electron configuration. The charge of a boron (B) ion is usually +3 because boron, being in Group 13, tends to lose three electrons in order to reach stability. The charge of an iodine (I) ion is usually -1 because iodine, which is in Group 17, tends to gain one electron to reach stability. Lastly, the charge of a bromine (Br) ion is usually -1, because bromine, also in Group 17, tends to gain one electron to attain a stable electronic configuration.