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3 years ago

The atomic number of an atom with 14 neutrons and a mass of 27 is 27 1 13

Chemistry

2 answers:

MrRissso [65]3 years ago

6 0

Answer:

Explanation:

The mass number of an atom is the sum of the number of protons and neutrons.

27 = protons + 14

protons = 13

The number of protons is equal to the atomic number.

galben [10]3 years ago

6 0

Answer: 41 or Niobium

Explanation: To get the number of Protons or Electrons given the number of Neutrons and Mass, you have to add the given numbers. This gives the number of Protons and Electrons which is the same number as the Atomic number. So, 14 Neutrons plus the mass of 27 is equal to 41, which gives the element Niobium

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13 Help lol please thanks

slamgirl [31]

Answer:

Mass = 15.13 g

Explanation:

Given data:

Number of atoms of hydrogen = 8.11×10²³

Mass of ammonia formed = ?

Solution:

Chemical equation:

3H₂ + N₂ → 2NH₃

Number of moles of hydrogen:

1 mole contain 6.022× 10²³ atoms

8.11×10²³ atoms × 1 mol / 6.022× 10²³ atoms

1.35 mol

Now we will compare the moles of hydrogen and ammonia:

H₂ : NH₃

3 : 2

1.35 : 2/3×1.35 = 0.89 mol

Mass of ammonia:

Mass = number of moles × molar mass

Mass = 0.89 mol × 17 g/mol

Mass = 15.13 g

5 0

3 years ago

Which of the following correctly identifies who is credited with key developments of the cell theory?

vampirchik [111]

Answer:

Matthias Schleiden, Theodor Schwann, and Rudolf Virchow

Explanation:

8 0

3 years ago

Substance A and B are colorless, odorless liquids that are nonconductors and flammable. The density of substance A is 0.97 g/mL;

tekilochka [14]

Answer:

A and B are not the same substances.

The reason is because they do not have the same density which is a function of their masses and volumes.

For instance, for every Volume of 1mL of each substances, A has a mass of 0.97g which is different from the 0.89g of B.

6 0

4 years ago

6. How does temperature relate to the layers of the atmosphere?

solniwko [45]

The atmosphere is divided into layers based on how the temperature in that layer changes with altitude, the layer's temperature gradient (Figure below). The temperature gradient of each layer is different. In some layers, temperature increases with altitude and in others it decreases.

8 0

4 years ago

The electron configuration for chromium is 1s22s22p63s23p63d54s1 instead of 1s22s22p63s23p63d44s1. The configuration is an excep

g100num [7]

Answer: The correct answer is Aufbau principle.

Explanation:

Pauli exclusion principle states that no two electrons with in an atom can have all four quantum numbers same.

Heisenberg principle states that it is impossible to measure with high precision the value of momentum and position of an electron.

Aufbau principle states that the electron will occupy the lowest energy level first before occupying the higher energy levels.

Schrodinger equation is used to find the allowed energy levels of quantum mechanical systems of an electron.

Chromium is the 24th element of the periodic table and its electronic configuration must be written as: $1s^22s^22p^63s^23p^63d^44s^2$

But the actual configuration for this is $1s^22s^22p^63s^23p^63d^54s^1$

This configuration is an exception to Aufbau's principle because half filled sub-levels is more stable than other configurations.

The actual configuration has half filled 'd' and 's' sub-levels but the expected configuration had fully filled 's' orbital and partially filled 'd' orbital.

Thus, actual configuration is accepted for chromium atom.

Hence, the correct answer is Aufbau's principle.

7 0

3 years ago