CHEMISTRY MIDDLE SCHOOL

4. Which of the following is a pseudo-noble-gas electron configuration?O A 1s22s22p3s23p%3d10
OB 1s22s22p63s23p6
OC 1s22s22p63s2305
OD 1s22s²2p63s23d10452

Answers

Answer 1
Answer:

Answer:

1s2 2s2 2p6 3s2 3d5  is a pseudo-noble-gas electron configuration

Explanation:

It is the technetium with atomic number 43. Being the lightest element having isotopes with all radioactive and no one are more stable as compared to that of technetium which is in fully ionised state i.e. 97 Tc. This element is mostly used for gamma ray emission in medical treatment. Also found to be used as corrosion inhibitor in case of steel, when present in small amount gives better result. This metal is silver grey colour that is found to discoloration when comes in contact with moist air. Its isotopes are radioactive.
Answer 2
Answer:

Answer:

1s2 2s2 2p6 3s2 3p6 3d10

Explanation:

A pseduo noble gas configuration refers to charged species with electron configurations that are almost identical to that of one of the noble gases.

The noble gas (n-1)d^10 (where n refers to the principal quantum number of the outer s orbital) configuration of ions is commonly known as a pseudo noble gas configuration. The configuration stated in the answer is for Cu^+ ion. n in the case of Cu^+ ion is 4(since copper metal has a 4s1 level).

Note that; 1s2 2s2 2p6 3s2 3p6 is the electron configuration for argon, followed by 3d^10. Hence our definition for a pseudo noble gas.

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What observations can you make about the valence electrons in the following columns of the periodic table? -Column 1:
-Column 2:
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Answers

Answer:

Column 1. They have one valence electron

Column 2. They have 2 valence electrons

Transition metal column. Variable oxidation states

Column 3–7. Valence electron ranges from 3 to 7 electrons

Column 8. Completely filled i.e no valence electron

Explanation:

Final answer:

Each column of the periodic table represents elements with a specific number of valence electrons. Columns 1 and 2 have one and two valence electrons respectively, and are known for their reactivity. Transition metals typically have one or two, Columns 3-7 have 3 to 7, and Noble Gases in Column 8 have a full shell of eight, making them unreactive.

Explanation:

We can categorize columns, or groups, of the periodic table by the number of valence electrons, which are the outermost electrons in an atom that participate in chemical bonding.

  • Column 1: These elements, also known as alkali metals, have a single valence electron in their outermost shell. These elements are highly reactive due to their tendency to lose this electron and achieve a stable configuration.
  • Column 2: These are the alkaline earth metals, which have two valence electrons. They are less reactive than alkali metals but will still readily lose their valence electrons to achieve stability.
  • Transition Metal Columns: These contain transition metals which typically have one or two valence electrons, although this can be more complex due to the filling of inner d orbitals.
  • Columns 3–7: Elements in these groups have 3 to 7 valence electrons respectively. Many form covalent bonds by sharing their valence electrons with other atoms.
  • Column 8: Known as the Noble Gases, these elements possess a stable full set of 8 valence electrons (except for Helium which has 2). They are very unreactive due to their stable electronic configuration.

Learn more about Valence Electrons here:

brainly.com/question/12717954

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Can someone explain #3

Answers

Answer:

Explanation:

Hey,

so here the student is saying that the given mass is of one atom. But when we usually talk about amu it is the unified atomic mass so mass of all the atoms present.

So that's why he is wrong.

Also the definitions states,

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope.

Answer:

See below.

Explanation:

121.76 amu is the Relative Atomic Mass of Antimony (the average mass of the different isotopes). . The element exists as a mixture of isotopes ,  the main one being  SB121 which has a mass of 121.

URGENT!!True or false: Light waves, gamma rays, and ocean waves are all 3 examples of energy traveling in waves.

Answers

Answer:

False

Explanation:

Ocean waves are something you can physically see whereas Gamma Rays and Light Waves are something on the Electromagnetic Spectrum.

Which two elements are least likely to react with each otherand form a compound? (1) A and G (2) D and G (3) J and M
(4) L and R ​

Answers

Answer:

1. A and G

Explanation:

Sun light and chemicals create _______ smog

Answers

 sun light and chemical create photochemical smog

How Do Clownfish Catch Their Food?

Answers

Clown fish get there food from anemone by eating by eating the algae
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