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inysia [295]
3 years ago
8

Which element is a metalloid? Check all that apply. selenium (Se) polonium (Po) silicon (Si) iodine (I) tin (Sn) antimony (Sb) p

hosphorus (P)

Chemistry
2 answers:
bulgar [2K]3 years ago
8 0
The metalloids are highlighted in the table.

Of the elements in the question, the following are metalloids...

<span>antimony (Sb)
</span><span>silicon (Si)
</span><span>polonium (Po) 

</span>

SVETLANKA909090 [29]3 years ago
8 0

Answer: Polonium (Po), Silicon (Si), Antimony(Sb)

Explanation: Metalloids are the elements which exhibits some properties of both metals and non-metals. They are generally called as  semi-metal. There are in total 7 metalloids in whole periodic table. They are:

Boron (B), Silicon (Si), Germanium (Ge), Arsenic (As), Antimony (Sb), Telurium (Te) and Polonium (Po).

From, the list and periodic table attached, it is visible that only Silicon, Polonium and antimony are the metalloids from the elements given.

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In the following reaction, identify the oxidized species, reduced species, oxidizing agent, and reducing agent. Be sure to answe
gtnhenbr [62]

Answer :

Cl_2 is reduced species.

KI is oxidized species.

Cl_2 is oxidizing agent.

KI is reducing agent.

Explanation :

Redox reaction or Oxidation-reduction reaction : It is defined as the reaction in which the oxidation and reduction reaction takes place simultaneously.

Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.

Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.

Reducing agent : It is defined as the agent which helps the other substance to reduce and itself gets oxidized. Thus, it will undergo oxidation reaction.

Oxidizing agent : It is defined as the agent which helps the other substance to oxidize and itself gets reduced. Thus, it will undergo reduction reaction.

The balanced redox reaction is :

Cl_2(aq)+2KI(aq)\rightarrow 2KCl(aq)+I_2(aq)

The half oxidation-reduction reactions are:

Oxidation reaction : 2I^-\rightarrow I_2+2e^-

Reduction reaction : Cl_2^++2e^-\rightarrow 2Cl^-

From this we conclude that the 'KI' is the reducing agent that loses an electron to another chemical species in a redox chemical reaction and itself gets oxidized and 'Cl_2' is the oxidizing agent that gain an electron to another chemical species in a redox chemical reaction and itself gets reduced.

Thus, Cl_2 is reduced species.

KI is oxidized species.

Cl_2 is oxidizing agent.

KI is reducing agent.

7 0
4 years ago
An atom has the following electron configuration.
kherson [118]

Answer:

5 electrons

Explanation:

Valence electrons are electrons located in the outermost energy shell, so you want to count the number of electrons in the last energy shell.

You can divide the configuration into 1s2 / 2s22p6 / 3s23p3 to see the energy shells in this atom. There are 3 shells occupied by the atom's electrons, so you need to count the electrons in the third shell as those are its valence electrons.

2 + 3 = 5 valence electrons total

Note: you don't count the 3 before the letter because that only indicates the shell level, not the number of electrons. Count only the exponents.

5 0
4 years ago
Read 2 more answers
WILL MARK BRAINLIEST! ANSWER QUICKLY!!!!
Hitman42 [59]
Hey there!

Density = 2.75 g/cm³

Volume = 8 cm³

Mass = ?

Therefore:

Mass =  Density * volume

Mass  =  2.75  * 8

Mass = 22 g
5 0
4 years ago
Read 2 more answers
Select the single best answer. Predict which of the following liquids has greater surface tension: ethanol (C2H5OH) or dimethyl
irina [24]

Answer:

Ethanol

Explanation :

The molecular structure of ethanol C2H5OH it is seen that there is a hydrogen atom attached to an oxygen atom, hence hydrogen bonding. This makes it has a greater surface tension than dimethyl ether.

Dimethy ether however has dipole moment in its structure. Dipole moments are said to be existent in a molecule when the charges are separated. This makes dimethyl ether have a lower surface tension. In the molecular tructure of dimethyl ether CH3OCH3) the oxygen atom is a negative atom in between two positive methyl group.

3 0
3 years ago
When you haven't eaten in awhile, your stomach sends a message through your _________________ to stimulate the _________________
mariarad [96]

nervous system/ nerve impulses

8 0
3 years ago
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