Which of the following statements about elements and atoms is true?
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Atoms of different elements are different based on the number of protons they have in their nucleus. This number, known as the atomic number, is unique to each element and defines its identity.
The modern atomic theory states that atoms of one element are the same, while atoms of different elements are different. What makes atoms of different elements different? The fundamental characteristic that all atoms of the same element share is the number of protons.
All atoms of hydrogen have one and only one proton in the nucleus; all atoms of iron have 26 protons in the nucleus. This number of protons is so important to the identity of an atom that it is called the atomic number (Z).
The number of protons in an atom is the atomic number of the element. Thus, hydrogen has an atomic number of 1, while iron has an atomic number of 26. Each element has its own characteristic atomic number.
Answer:
the first one
Explanation:
Related Questions
Are hydrogen bonds formed between all molecules?1.) No because hydrogen can only form these bonds with oxygen atoms. 2.) No because hydrogen can only form these bonds with highly electronegative atoms. 3.) Yes because hydrogen can easily form bonds with atoms that have a neutral charge. 4.) Yes because hydrogen can form these bonds with weakly electronegative atoms.
What is the temperature of the oceanic crust?
The table lists the lattice energies of some compounds. Compound Lattice Energy (kJ/mol) LiF –1,036 LiCl –853 NaF –923 KF –821 NaCl –786 Which statement about crystal lattice energy is best supported by the information in the table? The lattice energy increases as cations get smaller, as shown by LiF and KF. The lattice energy increases as the charge of anions increases, as shown by LiF and LiCl. The lattice energy decreases as anions get smaller, as shown by NaCl and NaF. The lattice energy decreases as the charge of cations decreases, as shown by NaF and KF.
Which energy transformation occurs when anelectrolytic cell is in operation? (1) chemical energy → electrical energy (2) electrical energy → chemical energy (3) light energy → heat energy (4) light energy → chemical energy
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Final answer:
An element's placement within a group on the periodic table is indicative of its electron configuration, specifically the number of valence electrons it has. As we move down a group, the principal quantum number increases, essentially moving to a higher energy level. Some elements show exceptions based on stability offered by half-filled or completely filled orbitals.
Explanation:
The placement of an element within a group on the periodic table has a direct correlation with its electron configuration. This connection is based on the fact that elements within the same group share the same number of valence electrons - electrons in the outermost shell of an atom that determine the chemical behavior of an element. This arrangement of elements gives the periodic table its periodic property, with recurring physical and chemical properties. An element's principal quantum number, representing the energy level of the electron, increases as we move down a group.
Although this pattern is generally accurate, there are exceptions to this rule, particularly when half-filled or completely filled orbitals can be formed which add to the atom's stability. Elements like chromium (Cr) and copper (Cu) demonstrate such anomalies.
The electron configuration of an atom, therefore, provides insights into the atom's properties, chemical behavior, and its placement on the periodic table. Understanding this connection between the location of an element on the periodic table and its electron configuration is crucial to predicting how elements will behave in chemical reactions.
Learn more about Electron Configuration and Periodic Table here:
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Answer:
That would be false
Explanation:
No need to explain
(2) hydrogen carbonate (4) oxalate
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Answer: The correct option is 2.
Explanation: Polyatomic ions are defined as the ions in which two or more elements are covalently bonded to act as a single unit. They always carry some charge.
Examples of polyatomic ions are: known as hydroxide ion,
known as sulfate ion
We are given a compound having 2 ions which are
and
. these ions are named as sodium ions and hydrogen carbonate ions.
Therefore, the correct option is 2.
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I hope this helps :)
(in scientific vocab)
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my guess i dont know exactly but heat is energy
heat absorbed or radiated during a change of phase at a constant temperature and pressure. specific heat. the heat required to raise the temperature of one gram of a substance one degree centigrade. heat of condensation. heat liberated by a unit mass of gas at its boiling point as it condenses into a liquid.