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3 years ago

Write the atomic number, atomic mass, number of protons, electrons and neutrons for the first five elements

Chemistry

1 answer:

stepladder [879]3 years ago

8 0

Answer:

The first five elements of the periodic table are:- hydrogen, helium, lithium, beryllium, boron

Explanation:

atomic number- it is represented by the letter Z. It is basically the total number of protons present in each atom's nucleus of that element.

atomic mass- is the mass of a single atom present in the element.

electrons and protons- they are negatively and positively charged particles found in the nucleus of the atom respectively.

neutrons- they have no or zero charge and weigh more than protons.

hydrogen (H)- 1 | 1.008 | 1 | 1 | 0

helium (He) - 2 | 4.0026 | 2 | 2 | 2

Lithium (Li) - 3 | 6.94 | 3 | 3 | 4

beryllium (Be) - 4 | 9.0122 | 4 | 4 | 5

Boron ( B) - 5 | 10.81 | 5 | 5 | 6

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Is oxygen a polar molecule or a nonpolar molecule?<br> Explain your reasoning.

Vlad1618 [11]

Answer:

Oxygen is a nonpolar molecule.

Explanation:

It is symmetric, because two oxygen atoms pull on the electrons equally. Propane is also nonpolar.

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3 years ago

What is the pH of a solution with a hydronium concentration of 0.36 M?

kodGreya [7K]

Answer:

Explanation:

The pH of a solution can be found by using the formula

$pH = - log [ { H_3O}^{+}]$

From the question we have

$pH = - log(0.36) \\ = 0.4436...$

We have the final answer as

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3 years ago

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3 years ago

Read 2 more answers

when 4.73g of solid was heated, the residue weighed 4.10g 320 cubic centimetre of gas( at RTP) was evolved. calculate the molecu

Eddi Din [679]

Answer:

48 g/mol

Explanation:

Step 1: Calculate the mass of the gas (m)

According to the law of conservation of mass, the mass of the solid before the decomposition must be equal to the sum of the masses of the solid residue and the gas

mSolid = mResidue + mGas

mGas = mSolid - mResidue = 4.73 g - 4.10 g = 0.63 g

Step 2: Convert 320 cm³ to L

We will use the conversion factor 1 L = 1000 cm³.

320 cm³ × 1 L/1000 cm³ = 0.320 L

Step 3: Calculate the moles of gas (n)

The gas is at room temperature (298.15 K) and room pressure (1 atm). We can calculate the moles of gas using the ideal gas equation.

P × V = n × R × T

n = P × V/R × T

n = 1 atm × 0.320 L/(0.0821 atm.L/mol.K) × 298.15 K = 0.0131 mol

Step 4: Calculate the molecular mass of the gas (M)

We will use the following expression.

M = m/n = 0.63 g/0.0131 mol = 48 g/mol

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3 years ago

How to balance barium and oxygen yield barium oxide

olga55 [171]

Barium : $Ba^{+2}$ with +2 being the charge
Oxygen : $O^{-2}$ with -2 being the charge

The given equation can be written as:
Ba + O = BaO

Since the sum charges of Barium and Oxygen equals 0, there is no need to add subscripts.

Both Ba and O appear on the left and right side of the equation once, so there is no need to add a coefficient.

Ba + O = BaO is balanced

4 0

3 years ago