Which properties of the isotopes must be different?
Isotopes. An isotope is one of two or more forms of the same chemical element. Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number, but a different number of neutrons giving each elemental isotope a different atomic weight.
What must happen to an atom?
Adding or removing protons from the nucleus changes the charge of the nucleus and changes that atom's atomic number. So, adding or removing protons from the nucleus changes what element that atom is! For example, adding a proton to the nucleus of an atom of hydrogen creates an atom of helium.
What is the mass of a neutron?
neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen. It has no electric charge and a rest mass equal to 1.67493 × 10−27 kg—marginally greater than that of the proton but nearly 1,839 times greater than that of the electron.
What are the two parts of an atom?
The two parts of an atom are the nucleus and the electron cloud. The nucleus is composed of protons and neutrons, densely packed in the nucleus and… See full answer below.
What is true about all uranium atoms quizlet?
What is true about all uranium atoms? They each have the same number of protons.
Which of the following is true regarding isotopes?
The isotopes have same atomic number and different mass number. Thus they have same number of protons and electrons and different number of neutrons and nucleons.
What can be said about all the atoms in an element?
Answer: All atoms have at least one proton in their core, and the number of protons determines which kind of element an atom is. … Unless specifically stated otherwise, atoms always have the same number of electrons as protons; therefore, you can find the electron number by looking at the atomic number.
What is the number of protons in a uranium atom?
92Uranium / Atomic number
Which statement about neutrons is true?
The correct answer is Neutrons revolve around the atomic nuclei. Neutron is among the primary constituents of atomic nuclei along with electrons and protons.
What is an atom made up of?
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.
Which statement is true about an atom that has fewer electrons than protons?
An atom that has fewer electrons than protons; the atom has a positive charge.
Is U 235 or U 238 more radioactive why quizlet?
U-235 is more radioactive because it has more electrons than U-238.
Which of the following statements is true of isotopes of the same elements?
That is, isotopes are atoms of same element existing in different number of neutrons, but same number of proton and electron. Therefore: Isotopes of an element truly have same chemical properties due to same number of valence electrons.
Which of the following statement is false about an atom?
Answer: (a) Atoms are not able to exist independently 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 is true about the atoms of the same element?
Atoms of the same element have the same atomic number so the number of protons (and electrons) are same. But they have same or different mass numbers (like that for isotopes). Different mass number will have different number of neutrons.
Do all atoms have neutrons?
Neutrons are found in all atoms except for most atoms of hydrogen. All the atoms of a given element have the same number of protons and electrons, but they may vary in their numbers of neutrons. Atoms of the same element that differ in their numbers of neutrons are called isotopes.
How many neutrons does a uranium atom have?
92Uranium / Atomic number
How many electrons are in a uranium atom?
2,8,18,32,21,9,2Uranium / Electrons per shell
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.
Are all atoms the same?
They are not the same at all. Every atom consists of three basic units protons, neutrons, and electrons and these units determine the physical and chemical properties of an atom and matter. But the presence of a different number of these units( protons, neutrons, and electrons) makes an atom unique from the other atom.
Which describes an atom that has fewer neutrons and protons and more electrons than protons?
An atom that has fewer neutrons than protons and more electrons than protons is a(n) ion.
Which statement is true of all neutral atoms?
Which of the following statements is true for neutral atoms? The number of neutrons in a neutral atom must always equal the number of electrons. It is possible for atoms of different elements to have the same number of neutrons. It is possible for atoms of different elements to have the same number of protons.
What is the atomic difference between uranium-235 and uranium-238 quizlet?
What is the atomic difference between uranium-235 and uranium-238? Uranium-235 has three fewer neutrons than uranium-238.
Why is U-235 a special element and what is it used for quizlet?
uranium-238 and uranium -235 are two radioactive isotopes of uranium, however, uranium-235 is the only naturally occurring fissionable (or fissile) material; therefore, it is essential to the production of nuclear energy.
What is true about isotopes of an element?
Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. The number of protons in a nucleus determines the element's atomic number on the Periodic Table.
Which one of the following statements applies to atoms which are isotopes of the same element?
The correct answer is They have the same mass number. The forms of an element that have the same atomic number but different mass numbers are called isotopes.
Which statement is true of atoms?
Explanation. The statement that is TRUE about atoms is “electrons determine the size of the atom.” The electrons surround the nucleus of an atom and they determine the space in which an atom occupies.
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 statement about atoms are true?
Explanation. The statement that is TRUE about atoms is “electrons determine the size of the atom.” The electrons surround the nucleus of an atom and they determine the space in which an atom occupies.
What do all atoms have in common?
Most atoms contain all three of these types of subatomic particles—protons, electrons, and neutrons.