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vova2212 [387]
3 years ago
5

What are periods on the periodic table? How many are there?

Chemistry
1 answer:
Brums [2.3K]3 years ago
8 0
A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left. A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements.
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What is the most important factor for the formation of a stable compound?
creativ13 [48]
The most important factor would be the number of electrons of the compound. Compounds need to achieve electron configuration the same as the noble gas. Noble gases are the most stable elements in the periodic table. Hope this answers the question.
7 0
3 years ago
Coffee with sugar dissolved in it is an example of a water­based solution. the hot water of the coffee is the __________________
kirill115 [55]
The Hot water of the cofee is the SOLVENT, Sugar is the SOLUTE, and this means the sugar molecules must be HYDROPHILIC
5 0
3 years ago
What is the molarity of 2.3 mol of Kl dissolved in 0.5 L of water
Nastasia [14]

Answer:

4.6\,\,moL\,\,L^{-1}

Explanation:

Molarity refers to a measure of concentration.

Molarity = moles of solute/Litres of solution

Molarity refers to number of moles of solute present in this solution.

In order to find a solution's molarity, use value for the number of moles of solute  and the total volume of the solution expressed in liters

As molarity of 2.3 mol of Kl is dissolved in 0.5 L of water,

Molarity = \frac{2.3}{0.5} =4.6\,\,moL\,\,L^{-1}

4 0
3 years ago
write a balanced chemical reaction when heated aluminium metal react with solid copper oxide produce copper metal and aluminium
prohojiy [21]

Answer:

<h2>2Al + 3CuO ==> 3Cu + Al2O3</h2>

Explanation:

So let's break this chemical equation down into 2 parts - Reactants and Products

Reactants = Al + CuO

Products = Cu + Al2O3

So the Chemical Reaction will be

Al + CuO ==> Cu + Al2O3

So the balanced equation will be,

2Al + 3CuO ==> 3Cu + Al2O3

PLS mark as brainliest

3 0
3 years ago
Which coefficient placed before HCl will balance the following<br> equation? Zn+HCI ZnCl2 + H2
cupoosta [38]

Explanation:

Given chemical equation

Zn + HCL ➡ ZnCl2 + H2

Now balancing

Zn + 2HCL ➡ ZnCl2 + H2

Hope it will help :)❤

3 0
3 years ago
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