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What is the nuclear symbol for an element with 9 protons and 10 neutrons?
The nuclear symbol for an element with 9 protons and 10 neutrons is 19F. The atomic number (number of protons) is shown as a subscript to the left of the element symbol, and the mass number (sum of protons and neutrons) is shown as a superscript to the left of the element symbol.
What element has the atomic number of 88?
The element with atomic number 67 is Holmium (Ho). Holmium is a Lanthanide in Group 6 of the Periodic Table. Holmium has 67 electrons in 6 shells with 2 electrons in the outer shell.
What was henry moseley contribution to the periodic table?
In 1912, Henry Moseley, an English physicist showed that periodicity was a fucntion of the atomic number rather than of atomic mass. Our present periodic tables are now constructed using atomic number as the basis of arranging the elements and the periodic law being stated as, the physical and chemical properties of the element are periodic functions of their atomic numbers. This periodic recurrence of properties is emphasized by arranging the elements in a table such that elements with similar properties are aligned in a vertical column. This arrangement is called the Periodic Table.
Who came up with this quote all atoms of a given element are identical but they differ from those of any other element?
This quote is attributed to British physicist and chemist John Dalton, who proposed the atomic theory of matter in the early 19th century. Dalton's theory stated that all atoms of a given element are identical and have specific characteristics that differentiate them from atoms of other elements.
What elements have 4 energy levels?
i dont idgaff
How do you estimate the number of neutrons in the atoms of an element?
The number of neutrons in the nucleus of an atom of any isotope of an element is equal to the "atomic mass number", which is usually stated in a number immediately after a hyphen at the end of the element name in the name of the isotope, minus the atomic number. Because most elements have more than one stable isotope, the average number of neutrons in the mixture of isotopes of an element that occurs naturally is usually not an integer.
What is the average number of comparisons in a sequential search?
If this is a homework related question, you really should consider trying to solve it yourself before looking at this answer. Otherwise, the value of the lesson, and the reinforcement provided by the assignment, will be lost to you. In a sequential search, where the elements are in a uniformly random distribution, the average number of comparisions to find a particular element is one half of the number of elements. Stated another way... In a sequential search, where the elements are in an arbitrary distribution, the average number of comparisions to find a random element is one half of the number of elements.
Does an element's number of valence electrons equals the element's number of protons?
Only hydrogen and helium have the stated property. For all heavier elements than these two, the number of valence electrons is less than the total number of electrons, which must be the same as the number of protons in all neutral atoms.
What is the nuclear symbol for an element with 9 protons and 10 neutrons?
The nuclear symbol for an element with 9 protons and 10 neutrons is 19F. The atomic number (number of protons) is shown as a subscript to the left of the element symbol, and the mass number (sum of protons and neutrons) is shown as a superscript to the left of the element symbol.
Dalton's atomic theory stated that every element was made of atoms that could not be subdivided atoms of the same element are like and?
Dalton's atomic theory states that elements are composed of indivisible atoms and that all atoms of a given element are identical in mass and properties. Atoms of different elements have different masses and properties.
Which of these elements is the smallest element sodium potassium rubidium or cesium?
Of the Group 1 elements stated (Na, K, Rb, Cs), Caesium is the largest as it is the furthest down the group, and Sodium is the smallest of those as it is furthest up the group.
When a number is stated as a percentage it means that number represents a portion of?
When a number is stated as a percentage, it represents a portion of a whole, typically expressed in terms of 100. For example, 25% indicates that the number is 25 out of 100 parts of the total. Percentages are often used to compare relative sizes or to express how much one quantity is in relation to another.
What conditions must be satisfied for two sets to be equal?
Two sets are considered equal if they contain exactly the same elements, meaning every element of the first set is also an element of the second set, and vice versa. This can be formally stated as ( A = B ) if and only if ( A \subseteq B ) and ( B \subseteq A ). Additionally, the order of elements and their repetition do not matter in sets; only the presence of the elements is relevant.
What represents an element in an atom?
Nothing. The question is wrongly stated. Each single atom is an element.
What is wrong with arranging the elements according to their atomic mass?
"Atomic mass" varies depending on the isotope. However, the AVERAGE atomic mass, (what's printed on most periodic tables) depends on the frequency with which different isotopes occur in nature. Therefore, if one element has a higher atomic mass than another, it doesn't mean that that element IS more massive, it just means that the more massive isotopes of that element occur more frequently in nature. It is a much more constant and reasonable method of organization to organize based on the number of protons in an atom of the element, since if the number of protons changes, you've got a different element. Also, an atoms properties are largely dependent upon the number of protons it contains, for the reason stated in the last sentence above.
Who is the scientist mosley?
in 1914 Henry mosely stated the modern periodic law. He said that when the elements are in order of increasing atomic number (number of protons) they show a periodicity or repeating pattern of properties.
What element has the atomic number of 88?
The element with atomic number 67 is Holmium (Ho). Holmium is a Lanthanide in Group 6 of the Periodic Table. Holmium has 67 electrons in 6 shells with 2 electrons in the outer shell.
