CHEMISTRY HIGH SCHOOL

What determines that an element is a metal?a. the magnitude of its charge
c. when it is a Group A element
b. the molecules that it forms
d. its position in the periodic table

Answers

Answer 1
Answer: Its position in the periodic table.
An element that readily formspositive ions is called a metal.The arrangement of chemical elements intabular form where the elements are ordered by their atomic number iscalled the periodic table. In a periodic table metals are on the left inyellow.
Answer 2
Answer:

The correct option is \boxed{{\text{d}}{\text{.}}\;{\text{its postion in periodic table}}}.

Further explanation:

The periodic properties are characteristics that are associated with the different elements found in the periodic table. The origin of different properties is the difference in the atomic structure of the different elements.

For a systematic study of the chemical and physical properties of different elements, they are placed in certain columns called groups and horizontal rows called periods.

The fundamental basis of this arrangement is periodic law that states that chemical elements must be listed in order of their increasing atomic number. When elements are placed in groups in such order it was observed that elements with similar chemical properties repeated after fixed intervals, this was discovered by the Russian scientist Mendeleev. For example, the elements placed in group 1 that included lithium, sodium, potassium, and cesium all reacted vigorously with water. Similarly, the elements in group 17 were termed as halogens as they all readily formed salts with metals of group 1.

The rows of the table called periods and have metals on the left and non-metals on the right. The columns also called groups contains elements with similar chemical properties.

Metals are very good reducing agents that have a high tendency to lose electrons. Their electronegativity is very low. Metals also form cations smaller than an original metal atom. They mostly form an ionic bond.

The properties that identify the metal can be determined by the following:

1. Electronic configuration: A metal generally has 1, 2 or 3valence electrons in its outermost shell.

2. Physical properties: A metal is generally lustrous, hard, malleable, ductile, and solid. It is a good conductor of heat and electricity.

3. Position in the periodic table: Metals are on the bottom left in the periodic table. They are found in group 1 of periodic table.

Therefore, an element is metal is determined by the position of an element in periodic table.

Learn more

1. Which type of bond formed between water brainly.com/question/1059245

2. Intermolecular forces of attraction brainly.com/question/6717479

Answer details

Grade: High School

Subject: Chemistry

Chapter: Periodic table

Keywords: electron, metals, nonmetals, group, period, position, electronic configuration, oxygen, hard, lustrous, element.

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A nuclear fission reaction and a nuclear fusion reaction are similar because both reactions(1) form heavy nuclides from light nuclides
(2) form light nuclides from heavy nuclides
(3) release a large amount of energy
(4) absorb a large amount of energy

Answers

Both reactions release a large amount of energy is the statement that is correct about the similarity between a nuclear fission reaction and a nuclear fusion reaction.

A nuclear reaction is a procedure that leads to combining and modifying the nuclei of atoms, absorbing or releasing particles and energy according to each case.

  • When nuclei fragment, the reaction is known as nuclear fission, which releases energy.

  • The reaction that occurs when two light atomic nuclei join together is known as nuclear fusion, generating a heavier nucleus and releasing a large amount of energy.

Therefore, we can conclude that while in a fusion reaction two or more light nuclei unite, in a fission reaction a heavy nucleus breaks, both cause the release of energy.

Learn more about nuclear reactions here: brainly.com/question/14019172

Answer: (3) release a large amount of energy

Explanation:

Nuclear fusion is a process which involves the conversion of two small nuclei to form a heavy nuclei along with release of energy.

4_1^1\textrm{H}\rightarrow _2^4\textrm{He}+2_(+1)^0\textrm{e}+\text{energy}

Nuclear fission is a process which involves the conversion of a heavier nuclei into two or more small and stable nuclei along with the release of energy.

_(92)^(235)\textrm{U}+_0^1\textrm{n}\rightarrow _(56)^(143)Ba+_(36)^(90)Kr+3_0^1\textrm{n}+\text{energy}

Thus in the both the reactions energy is released.

The average atomic mass of oxygen is 15.9994 amu. The atomic masses of its three isotopes are as follows: O-16: 15.995 amu; O-17: 16.999 amu; O-18: 17.999 amu Which isotope is most likely to have the greatest abundance in nature?

Answers

Answer:

O-16 isotope is most likely to have the greatest abundance in nature.

Explanation:

Atomic mass of an isotopes of oxygen elements:

  • O-16: 15.995 amu
  • O-17: 16.999 amu
  • O-18: 17.999 amu

Average atomic mass of an oxygen atom = 15.994 amu

Isotope with the value of atomic mass closest to the average atomic mass of the oxygen atom will have the greatest abundance in nature. As it will be found in much more greater extent in nature.

Where as isotope which is least close to the average atomic mass will have less abundance in nature.

O-16 isotope is most likely to have the greatest abundance in nature.

15.995 amu ≈ 15.994 amu

I need help fast. i will give you 85 points

Answers

Answer:

H3AsO4 → As2O5 + H2O

Explanation:

The first equation is balanced:

H3AsO4 → As2O5 + H2O

Here's a breakdown of the balanced equation:

Reactants:

H3AsO4: 3 hydrogen atoms, 1 arsenic atom, and 4 oxygen atoms

Products:

As2O5: 2 arsenic atoms and 5 oxygen atoms

H2O: 2 hydrogen atoms and 1 oxygen atom

As you can see, the number of atoms of each element is the same on both sides of the equation. This means that the equation is balanced.

Which two factors must be equal when a chemical reaction reaches equilibrium?(1) the concentration of the reactants and the concentration of the products
(2) the number of reactant particles and the number of product particles
(3) the rate of the forward reaction and the rate of the reverse reaction
(4) the mass of the reactants and the mass of the products

Answers

The correct answer is the statement in option 3. Chemical equilibrium is achieved when both the reactants and the products are in concentrations that has no further tendency to change even as time goes to infinity. This happens when the forward reaction rate is the same as the reverse reaction rate.

How many total electrons can be contained in the 4d sublevel?
2
6
10
14

Answers

The s sublevel has just one orbital, so can contain 2 electrons max. The p sublevel has 3 orbitals, so can contain 6 electrons max. The d sublevel has 5 orbitals, so can contain 10 electrons max. And the 4 sublevel has 7 orbitals, so can contain 14 electrons max.
So, having this in mind, 10 electrons in total can be contained in the 4d sublevel.
The maximum number is 10

Which statement best explains the relationship between the electric force between two charged objects and the distance between them?

Answers

Answer:

D.  

As the distance increases by a factor, the electric force decreases by the same factor.

Explanation:
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