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3 years ago

Lanthanides and actinides are kept separately in the periodic table. why?

1 answer:

6 0

The lanthanides and actinides are separated from the rest of the periodic table, usually appearing as separate rows at the bottom. The reason for this placement has to do with the electron configurations of these elements.

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Of the following pairs of atoms, which is the more electronegative? Cl or I

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Answer:

Chlorine is more electronegative than iodine. The electronegativity of chlorine is 3.16. The electronegativity of iodine is 2.66.

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2 years ago

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4 years ago

Which compound will give positive Tollen's test?

DanielleElmas [232]

Tollen's test is a test for aldehyde giving a silver mirror in its presence, hence also called silver mirror test. Among the choice, c. pentanal is the aldehyde. Answer is C.

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4 years ago

How many mililiters of a 6 00 M NaOH solution are needed to provide 0 330 mol of NaOH?

Bumek [7]

Answer:

55mL of sodium hydroxide are required.

Explanation:

Given data:

Molarity of NaOH solution = 6.00 M

Number of moles of NaOH = 0.330

Volume required = ?

Solution:

Formula:

M = n/v

M = molarity

n = number of moles

v = volume

Now we will put the values in formula.

6.00 M = 0.330 mol / v

v = 0.330 mol / 6.00 M

v = 0.055 L (M = mol/L)

v = 0.055 L × 1000 mL/ 1L

v = 55 mL

55mL of sodium hydroxide are required.

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3 years ago

Write electron configurations for Gallium, Ga (Z=31), and show the total valence electrons

ivann1987 [24]

<u>Answer:</u> The electronic configuration of gallium is written below and number of valence electrons is 3.

<u>Explanation:</u>

Electronic configuration is defined as the representation of electrons around the nucleus of an atom.

Number of electrons in an atom is determined by the atomic number of that atom.

Valence electrons are defined as the electrons present in the outermost shell of an atom.

We are given:

An element Gallium having atomic number as 31.

Number of electrons = 31

Electronic configuration of Gallium is: $(Z=31):1s^22s^22p^63s^23p^64s^23d^{10}4p^1$

This element has 3 electrons in its outermost shell. So, the number of valence electrons is 3

Hence, the electronic configuration of gallium is written below and number of valence electrons is 3.

3 0

4 years ago

Lanthanides and actinides are kept separately in the periodic table. why? ​

Lanthanides and actinides are kept separately in the periodic table. why?