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GarryVolchara [31]
3 years ago
6

Ldentify the atom whose nucleus is composed of 56 protons and 82 neutrons.

Chemistry
1 answer:
kenny6666 [7]3 years ago
4 0

Answer:

Barium-138

Explanation:

The mass number is the atomic number + the number of neutrons. ... Identify the atom whose nucleus is composed of 56 protons and 82 neutrons. Barium-138 (the number of protons identifies the atom) Gallium has two naturally occurring isotopes: Ga-69 with a mass of 68.9256 amu and a natural abundance of 60.11% and Ga-71.

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How does a lithium cation compare to a lithium atom?
kirill [66]

Lithium cation and Lithium atom can be compared as follow;

<h3>1) Charge:</h3>

              The charge on Lithium atom is zero means, it has same number of protons and electrons. Hence, the nert effect is cancelled out and the atom gets zero charge.

               On the other hand, Lithium cation is formed when it looses one electron. Therefore, the number of protons are greater by one number as compared to number of electrons resulting in the formation of +1 charge as shown below,

                                                Li    →    Li⁺¹  +  e⁻

<h3>2) Size:</h3>

           Secondly, Lithium atom has greater size as compared to Lithium cation because due to presence of greater number of protons compared to electrons in Lithium cation the nuclear charge appears to be greater as compared to neutral atom hence, pulling the valence electrons more effectively making the lithium cation smaller in size as compared to neutral atom.

<h3>3) Reactivity:</h3>

                     We can also compare the reactivity of both species. The neutral will be more reactive than the charged atom because it is containing one valence electron and can donate it when ever it comes in contact with non-metals.

8 0
3 years ago
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119 mL of 4.0 M H2SO4 with 229 mL of H2O
motikmotik

Answer:

Uhhhu

Explanation:

4 0
3 years ago
What is the trend in electronegativity as elements are considered from left to right in the periodic table?
Readme [11.4K]

Answer:

the answer is

the electronegativity of the elements from L to R increases

8 0
3 years ago
How many Chlorine atoms are in 2.5 moles of CaCl2?
Iteru [2.4K]

Answer:

You may know the formula of calcium chloride (is:-CaCl2)

So.

CaCl2 ⇄ Ca-²+2Cl-¹

1mole⇄1mole+2moles

So from above ..

1mole CaCl2 produce 1mole Ca-² & 2 moles of Cl-².

For 2.5 moles we multiply the above chemical eq. With 2.5

2.5CaCl2⇄2.5Ca-²+5Cl-¹

So from 2.5 moles of CaCl2 we get 2.5 mole calcium ion and 5 moles chloride ion…

Explanation:

3 0
3 years ago
What is a pure substance that contains atoms of more than one element called?
zhuklara [117]

Answer: A compound

Explanation: Pure substances made of more than one element are called. compounds. The chemical formula for a molecule of nitrogen is. N2. The balanced equation for the formation of water from the elements hydrogen and oxygen is.

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3 years ago
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