64 Questions
What is the charge of an electron?
1.6 × 10⁻¹⁹ C negative
What determines the atomic number of an element?
The number of protons in the nucleus
What is the mass of a proton?
1.6726 × 10⁻²⁷ kg
What is the role of neutrons in the nucleus?
They contribute to the atomic mass
What is the location of electrons in an atom?
In the outer regions of the atom
What is the charge of a proton?
1.6 × 10⁻¹⁹ C positive
What is the approximate mass of an electron?
9.11 × 10⁻³¹ kg
Why do neutrons contribute to the atomic mass?
Because they have a significant mass
What is the atomic number of an atom?
The number of protons in the nucleus
What is the atomic mass number of an atom?
The sum of protons and neutrons in the nucleus
What is the chemical symbol of an element?
A unique abbreviation for the element
What is an isotope of an element?
An atom with a different number of neutrons
What is a cation?
A positively charged ion
What is an anion?
A negatively charged ion
What is the difference between a neutral atom and an ion?
The number of electrons
What is the standard notation for representing an element?
(^{A}_{Z}Symbol)
Which of the following subatomic particles has a positive electric charge?
Proton
What is the primary function of electrons in an atom?
To participate in chemical reactions
Which subatomic particle is responsible for determining the chemical properties of an element?
Proton
What is the significance of the number of protons in a neutral atom?
It balances the number of electrons
What is the role of neutrons in the nucleus?
To stabilize the nucleus
What is the relationship between the number of protons and electrons in a neutral atom?
The number of protons is equal to the number of electrons
What is the significance of the atomic number of an element?
It determines the chemical properties
What is the characteristic of the mass of protons and neutrons?
They are similar in mass
What is the primary function of the atomic number in an atom?
To identify the element and its properties
What is the sum of protons and neutrons in the nucleus of an atom?
Atomic mass number
What is the primary difference between isotopes of the same element?
Number of neutrons
What is the result of an atom losing one electron?
A positively charged ion
What is the symbol for a carbon atom with 6 protons and 6 neutrons?
^{12}_6C
Why do isotopes of the same element exhibit the same chemical properties?
Because they have the same atomic number
What is the charge of a sodium ion (Na⁺) formed by the loss of one electron from a sodium atom?
Positive
What is the difference between a neutral atom and an ion?
Number of electrons
Which of the following subatomic particles has no electric charge?
Neutron
What determines the position of an element in the periodic table?
Number of protons
Which of the following is true about the mass of protons and neutrons?
Protons and neutrons have roughly similar masses
What is the primary function of electrons in chemical reactions?
To interact with electrons from other atoms
Which of the following is a characteristic of isotopes of the same element?
They have the same number of protons
What is the relationship between the number of protons and electrons in a neutral atom?
The number of protons is equal to the number of electrons
What determines the atomic mass of an element?
Sum of protons and neutrons
What is the primary function of the nucleus in an atom?
To stabilize the atom
What is the primary function of the atomic number in an atom?
Defining the identity of the element
What is the difference between a carbon-12 atom and a carbon-14 atom?
The number of neutrons in the nucleus
What is the result of an atom gaining one electron?
An anion is formed
What is the significance of the atomic mass number of an element?
It provides a measure of the mass of the nucleus
What is the characteristic of the atomic number of an element?
It is unique to each element
What is the notation for representing an element with an atomic number of 6 and an atomic mass number of 12?
¹²C₆
Why do atoms of the same element with different atomic mass numbers exhibit the same chemical properties?
Because they have identical numbers of protons and electrons
What is the result of an atom losing one electron?
A cation is formed
What is the primary reason why isotopes of the same element exhibit the same chemical properties?
They have the same number of protons and electrons
Which of the following statements is true about the atomic number of an element?
It determines the chemical properties of an element
What is the result of an atom gaining or losing electrons?
It becomes an ion
What is the significance of the atomic mass number of an element?
It provides a measure of the mass of the nucleus and indirectly the mass of the atom
Which of the following statements is true about cations and anions?
Cations are positively charged ions and anions are negatively charged ions
What is the difference between the atomic number and the atomic mass number of an element?
The atomic number is the number of protons and the atomic mass number is the sum of protons and neutrons
What is the notation for representing an element with an atomic number of 6 and an atomic mass number of 14?
₆¹⁴C
What is the primary reason why atoms of the same element have different atomic mass numbers?
They have different numbers of neutrons
What is the primary reason why electrons are fundamental in chemical reactions and bonding?
They occupy the outer regions of atoms and interact with electrons from other atoms.
What is the relationship between the number of protons and electrons in a neutral atom?
The number of protons is equal to the number of electrons.
What is the primary function of the nucleus in an atom?
To stabilize the atom and determine its chemical properties.
What is the characteristic of the mass of protons and neutrons?
They are roughly similar in mass and significantly greater than that of electrons.
What determines the position of an element in the periodic table?
The atomic number of the element.
What is the significance of the atomic number of an element?
It determines the chemical properties of the element.
What is the primary difference between isotopes of the same element?
The number of neutrons in the nucleus.
What is the significance of the atomic mass number of an element?
It is a sum of protons and neutrons in the nucleus.
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