(Video Ruangguru)- ruangbelajar - Kimia SMA - Struktur Atom| bimbel online

Summary

The transcript explains the basic structure of an atom, focusing on the three fundamental particles: protons, neutrons, and electrons. It describes how protons and neutrons are located in the nucleus, with their combined number representing the atomic mass. An example is given where an atom with an atomic mass of 40 and 20 neutrons would have 20 protons. The number of electrons equals the number of protons, unless the atom is ionized. In a positively charged atom (like A2+), two electrons are lost, leaving 18 electrons in total.

Takeaways

• 😀 Atoms are made up of three fundamental particles: protons, neutrons, and electrons.
• 😀 Protons and neutrons are located in the nucleus of the atom.
• 😀 The total number of protons and neutrons is called the atomic mass number.
• 😀 If the atomic mass number is 40 and the number of neutrons is 20, the number of protons is calculated by subtracting the number of neutrons from the atomic mass number, i.e., 40 - 20 = 20.
• 😀 Electrons are located outside the nucleus of the atom.
• 😀 The number of electrons in a neutral atom is equal to the number of protons.
• 😀 In a positively charged atom, such as A2+, electrons are lost from the outer shell.
• 😀 For an atom with a +2 charge (A2+), 2 electrons are released, leaving 18 electrons.
• 😀 The number of protons in an atom determines its chemical identity and its atomic number.
• 😀 The script explains how to calculate the number of protons, neutrons, and electrons in an atom based on its atomic mass number and charge.

Q & A

What are the basic particles that make up an atom?

An atom is made up of three basic particles: protons, neutrons, and electrons.

Where are protons and neutrons located in an atom?

Protons and neutrons are located in the nucleus (core) of the atom.

What does the atomic mass number represent?

The atomic mass number represents the sum of protons and neutrons in an atom.

How can you calculate the number of protons if the atomic mass number and number of neutrons are known?

The number of protons can be calculated by subtracting the number of neutrons from the atomic mass number.

In the case where the atomic mass number is 40 and the number of neutrons is 20, how many protons are there?

There are 20 protons, since 40 (atomic mass number) minus 20 (neutrons) equals 20 protons.

Where are electrons located in an atom?

Electrons are located outside the nucleus, orbiting the atom.

What is the relationship between the number of protons and electrons in a neutral atom?

In a neutral atom, the number of electrons is equal to the number of protons.

What happens to the number of electrons in a positively charged atom?

In a positively charged atom, electrons are removed from the outer shell. For example, in an atom with a 2+ charge, 2 electrons will be removed.

If an atom has a 2+ charge, how many electrons are left?

An atom with a 2+ charge will have 2 fewer electrons, so if the atom originally had 20 electrons, it will have 18 electrons remaining.

What is the electron count for an atom with 20 protons and a 2+ charge?

For an atom with 20 protons and a 2+ charge, there will be 18 electrons remaining.