What is the best describes an atom?
An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.
What is the statement of an atom?
Answer: Atoms are the smallest particle that has all the properties of the element. . Similar: All are made of empty space, have same structure (nucleus and electron cloud), very small Different: Different properties for different elements (atoms), different sizes. 2. I can describe protons, electrons, and neutrons.
Which statement best describes an atom’s atomic number?
atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number.
Which of the following statement is correct about an atom?
Solution. An atom must have a proton and an electron, but it may not have a neutron. For example, in hydrogen atom, there is 1 proton, 1 electron but no neutron.
Which is a characteristic of atoms?
The single most important characteristic of an atom is its atomic number (usually denoted by the letter Z), which is defined as the number of units of positive charge (protons) in the nucleus. For example, if an atom has a Z of 6, it is carbon, while a Z of 92 corresponds to uranium.
What is atom definition with example?
An atom is any particle of matter at its most basic level which contains at least one proton. Here are some examples of the atoms: hydrogen (H) and neon (Ne).
What are some true statements about atoms?
Atoms are the building blocks of matter. They are the smallest particles of an element that still have the element's properties. All atoms are very small, but atoms of different elements vary in size. Three main types of particles that make up all atoms are protons, neutrons, and electrons.
What is the best description for the atomic number of an atom quizlet?
Which of the following best describes the atomic number of a atom? The number of protons in an atom.
Which of the following statements is not true about an atom *?
It is not true that atoms cannot exist independently. Atoms of most elements cannot exist independently, although inert gases can exist as atoms.
Which of the following statements about the mass of an atom is true?
The correct option is (b) The atomic number is the same as the number of protons. The atomic mass is the sum of a number of protons and neutrons. See full answer below.
What are 3 characteristics of an atom?
Atoms are the smallest fraction of an element that can exist, and still show the characteristics of the element. Atoms themselves are composed essentially of electrons (1 negative charge), protons (1 positive charge), and neutrons (no charge).
What is a characteristic of atoms quizlet?
atom. Basic unit of a chemical element; smallest unit of matter; extremely small. nucleus.
Who defined the atom?
The idea that everything is made of atoms was pioneered by John Dalton (1766-1844) in a book he published in 1808. He is sometimes called the "father" of atomic theory, but judging from this photo on the right "grandfather" might be a better term.
What is the structure of an atom?
Atoms consist of an extremely small, positively charged nucleus surrounded by a cloud of negatively charged electrons. Although typically the nucleus is less than one ten-thousandth the size of the atom, the nucleus contains more that 99.9% of the mass of the atom.
Which definition best describes the atomic mass of an element?
The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu.
Which of the following statements correctly describe the nucleus of the atom?
Which statement correctly describes the nucleus of the atom? The nucleus of the atom contains most of the mass of an atom. You just studied 8 terms!
Which among the following statements about an atom is not correct?
Answer: (a) Atoms are not able to exist independently It is not true that atoms cannot exist independently.
Which of the following statement is true about the atomic number of atom?
The correct option is (b) The atomic number is the same as the number of protons. The atomic mass is the sum of a number of protons and neutrons. See full answer below.
What is a characteristics of an atom?
It is composed of protons, which have a positive charge, and neutrons, which have no charge. Protons, neutrons, and the electrons surrounding them are long-lived particles present in all ordinary, naturally occurring atoms.
What is a fact about atoms?
Atoms are very small. The average atom is about one-tenth of a billionth of a meter across. The largest atom (cesium) is approximately nine times bigger than the smallest atom (helium). Although atoms are the smallest unit of an element, they consist of even tinier particles called quarks and leptons.
What is a characteristic of an atom?
The single most important characteristic of an atom is its atomic number (usually denoted by the letter Z), which is defined as the number of units of positive charge (protons) in the nucleus. For example, if an atom has a Z of 6, it is carbon, while a Z of 92 corresponds to uranium.
What characteristic of an atom defines the element?
Answer and Explanation: The one characteristic of an atom that determines its element classification is the number of protons found in the atom's nucleus.
How can we describe atom with an example?
An atom is any particle of matter at its most basic level which contains at least one proton. Here are some examples of the atoms: hydrogen (H) and neon (Ne).
What is an atom quizlet?
Atom. An atom is the smallest particle of an element that still has elemental properties. Atoms are made up of similar properties called protons, neutrons, and electrons.
Is the atom neutral?
Atoms are neutral; they contain the same number of protons as electrons. By definition, an ion is an electrically charged particle produced by either removing electrons from a neutral atom to give a positive ion or adding electrons to a neutral atom to give a negative ion.
Which of the following statements correctly describes the atomic number of an element?
The correct answer is A. The atomic number of an element is equal to the number of protons in the atom's nucleus.
Which of the following statements correctly describe an element?
Answer and Explanation: The correct choice is A) a material consisting of only one type of atom. Elements are pure substances that cannot be broken down further by…
Which of the following is true about an individual atom?
An individual atom does not possess a state of matter. Rather, it is the arrangement of atoms that prescribes a particular state of matter. A solid, for instance, would be comprised of a bunch of atoms tightly packed together.
Which one of the following statement about the atomic nucleus is accurate?
Option (c) All nuclei have nearly the same density. Therefore, it says that all nuclei have nearly the same density. Nucleons combine to form a nucleus as though they were tightly packed spheres.
Which statement is correct for the nucleus of an atom?
The total number of protons in the nucleus of an atom gives us the atomic number of that atom. Hence, statement a is correct.