1.
What charge are electrons?
Explanation
Electrons are negatively charged particles. They carry a negative charge, which is why they are attracted to positively charged particles and repel other negatively charged particles. This property of electrons is fundamental to their behavior in various electrical and chemical processes.
2.
What are the neutrally charged particles in an atom called?
Explanation
Neutrally charged particles in an atom are called neutrons. Neutrons are subatomic particles that have no charge, meaning they are electrically neutral. They are found in the nucleus of an atom along with protons, which have a positive charge, and electrons, which have a negative charge. Neutrons play a crucial role in determining the stability and mass of an atom.
3.
How many electrons fit in the first shell?
Explanation
The first shell of an atom can hold a maximum of 2 electrons. This is because the first shell, also known as the K shell, has only one subshell, which can accommodate a maximum of 2 electrons. Therefore, the correct answer is 2 or two.
4.
What determines the atomic number of an atom?
Explanation
The atomic number of an atom is determined by the number of protons it contains. Protons are positively charged particles found in the nucleus of an atom. Each element has a unique number of protons, which is reflected in its atomic number. Therefore, the correct answer is "the number of protons" or "protons" or "number of protons."
5.
Which theorist came up with the idea of electrons being able to change levels?
Explanation
Bohr is the correct answer because he proposed the concept of electrons being able to change energy levels in an atom. According to Bohr's atomic model, electrons orbit the nucleus in specific energy levels or shells. When an electron absorbs or emits energy, it can transition between these energy levels, resulting in the emission or absorption of specific wavelengths of light. This theory revolutionized our understanding of atomic structure and laid the foundation for further developments in quantum mechanics.
6.
If an atom has 6 protons and its mass number is 14, how many electrons does it have?
Explanation
The number of protons in an atom determines its atomic number, which in turn determines the number of electrons in a neutral atom. Since the atom in question has 6 protons, it also has 6 electrons. The mass number, which is the sum of protons and neutrons, is not relevant to determining the number of electrons.
7.
How many electrons fit in the second shell of an atom?
Explanation
The second shell of an atom can hold a maximum of 8 electrons. This is because the second shell has a maximum capacity of 8 electron slots or orbitals. Each orbital can accommodate up to 2 electrons, so when all 8 orbitals are filled, the second shell is complete. Therefore, the correct answer is 8 or "eight".
8.
If an atom has 6 protons and its mass number is 14, how many neutrons does it have?
Explanation
The mass number of an atom is the sum of its protons and neutrons. In this case, the atom has 6 protons, so to find the number of neutrons, we subtract the number of protons from the mass number. Therefore, if the mass number is 14, and the atom has 6 protons, it must have 8 neutrons.
9.
Which part of an atom has the least mass?
Explanation
The correct answer is electrons. Electrons are subatomic particles that orbit the nucleus of an atom. They have a very small mass compared to protons and neutrons, which are the other particles present in the nucleus. Electrons are negatively charged and are responsible for chemical bonding and the flow of electricity in atoms.
10.
In Thomson's plum pudding model (chocolate chip cookie) the chips or plums represent:
Explanation
In Thomson's plum pudding model, the chips or plums represent electrons, which are negatively charged particles. This model suggests that the atom is a positively charged sphere with negatively charged electrons embedded within it, similar to the chips in a chocolate chip cookie. This model was proposed by J.J. Thomson in the early 20th century and was later replaced by the more accurate nuclear model of the atom.
11.
What is the name of the central region of an atom?
Explanation
The central region of an atom is called the nucleus. It is composed of protons and neutrons, which are tightly packed together. The nucleus is positively charged due to the presence of protons and it contains most of the mass of the atom. The electrons, which are negatively charged, orbit around the nucleus in specific energy levels. The nucleus plays a crucial role in determining the properties and behavior of an atom.
12.
What are atoms called that have the same number of protons but a different number of neutrons?
Explanation
Isotopes are atoms that have the same number of protons but a different number of neutrons. They have the same atomic number but different atomic masses. An isotope refers to a single atom with a specific number of protons and neutrons, while isotopes refer to multiple atoms with the same number of protons but different numbers of neutrons.
13.
What is the smallest particle into which an element can be divided?
Explanation
The correct answer is "atom." An atom is the smallest particle into which an element can be divided. It is the basic unit of matter and retains the chemical properties of the element. Atoms are made up of protons, neutrons, and electrons. The other options provided, "an atom," "atoms," and "atomos," are all variations of the correct answer.
14.
If an atom has 5 protons, 5 electrons, and 5 neutrons, what is it's atomic mass?
Explanation
The atomic mass of an atom is determined by the sum of its protons and neutrons. In this case, the atom has 5 protons and 5 neutrons, resulting in a total of 10 particles. Therefore, the atomic mass of the atom is 10.
15.
Who came up with the idea of electron clouds?
Explanation
Heisenberg is credited with coming up with the idea of electron clouds. He proposed the concept as part of his uncertainty principle, which states that it is impossible to know both the exact position and momentum of a particle simultaneously. The electron cloud model describes the probability distribution of finding an electron in a particular region around the nucleus. This model is widely accepted and forms the basis of our understanding of atomic structure.