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Diano4ka-milaya [45]
3 years ago
5

How many elements have an atomic number of 42? (Science)

Chemistry
1 answer:
pychu [463]3 years ago
5 0
The top number on elements in the periodic table is the atomic number, so when you look at the periodic table you can see that 42 is Mo (Molybdenum), and this is the only element with that atomic number.

Hope this helped! Please rate 5 starts and hit thanks if it did :)
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?cobalt has a density of 8.90 g. what volume would 17.8 g of Cobalt occupy?
Airida [17]

Answer:

Explanation:

Given parameters:

Density of cobalt = 8.9gcm⁻³

Mass of cobalt = 17.8g

Solution

Density can be defined as the mass per unit volume of a substance:

                      Density = \frac{mass in g}{volume in cm^{3} }

The unknown in the problem is Volume:

                    Volume = \frac{mass}{Density}

                     Volume =   \frac{17.8}{8.9} = 2cm³

5 0
3 years ago
Which of the following is generally FALSE? Group of answer choices Elements in the same group have the same valence electron con
Whitepunk [10]

Answer: Option (c) is the correct answer.

Explanation:

Generally, when we move from top to bottom in a group then there occur increase in the number of electrons due to which there will also occur increase in the number of shells.

As atomic size is the distance between the nucleus and valence shell of an atom. Hence, more is the number of shells present in an atom more will be its atomic radius.

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3 0
3 years ago
2. What mass of water absorbs 6700 J of heat to raise the temperature from 283K to 318K?​
Alexxandr [17]

Answer:

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Explanation:

7 0
2 years ago
based on table s an atom of which elements has the weakest attraction for electrons in a chemical bond
Norma-Jean [14]
It seems that you have missed the necessary table for us to answer this question, so I had to look for it. Anyway, here is the answer. <span>Based on Table S, an atom of the element POLONIUM has the weakest attraction for electrons in a chemical bond. Hope this answers your question.</span>
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3 years ago
Which of the following is an endothermic reaction?
telo118 [61]
The answer is the reaction ins a cold pack
5 0
3 years ago
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