what is an atomic number ks3?
428894
We are shown that the atomic number is the number of protons in an atom. We see that the mass number minus the atomic number is the number of neutrons. We complete the atomic structure by explaining that atoms have the same number of protons and electrons.
1302933
The atomic number stands for the number of protons in an atom of the element. The number of protons determines the identity of the element, So the atomic number identifies the element.
294910
The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. ... The sum of the atomic number Z and the number of neutrons N gives the mass number A of an atom.
231348
The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
631574
Answer Key The number of protons an atom has is called its atomic number, which decides what kind of atom it is. Changes in the number of neutrons make an isotope, and changes to the number of electrons make an ion. (A) They are made up of subatomic particles called protons, electrons and neutrons.
207983
Multiply the element's atomic number by the number of atoms of this type (see Step 1) in the molecule. Repeat for all elements in the molecule, then add up all the products to calculate the number of electrons. In the first example, the number of electrons in KNO3 equals (19 x 1) + (7 x 1) + (8 x 3) = 50.
524370
The term atomic number, conventionally denoted by the symbol Z, indicates number of protons present in the nucleus of an atom, which is also equal to the number of electrons in an uncharged atom. The number of neutrons is represented by the neutron number (N).
178818
The atomic numbers are listed along with the names and symbols of the elements on the inside cover of the text. The atomic number equals the charge on the nucleus. It therefore also equals the number of protons in the nucleus and also equals numerically the number of electrons in the neutral atom.
881529
Explanation: The atomic number is used to identify an element, and the atomic number is the number of protons in the nuclei of an element. Every element has its own unique number of protons, and therefore, atomic number.
1443578
Explanation: The atomic number is by definition the number of protons, positively charged particles, contained within the atomic nucleus. So if there are 7 protons, there MUST be 7 electrons, 7 negatively charged particles. ... Given that we have 15N , there must be 8 neutrons contained within the nucleus.
708096
Atomic Number and Mass Number While the mass number is the sum of the protons and neutrons in an atom, the atomic number is only the number of protons. The atomic number is the value found associated with an element on the periodic table because it is the key to the element's identity.
931295
A neutral atom of calcium, atomic number 20, contains 20 protons and 20 electrons. It has zero net charge. We calculate the number of neutrons in an atom from its mass number and atomic number: Potassium has a mass number of 39 and an atomic number of 19.
745976
Atomic Number. Indicates the number of protons in the nucleus. The atomic number defines an atom. All atoms of an element have the same atomic number. No two elements have the same atomic number.
707355
The number of protons in an atom is called its atomic number (Z). This number is very important because it is unique for atoms of a given element. ... Therefore, the atomic number of an atom also tells you how many electrons the atom has. This, in turn, determines many of the atom's chemical properties.
1277143
An atomic number is the number of protons in a nucleus. The number of protons in a nucleus is a factor that introduces instability. All the elements beyond those found in nature were synthesized.
849621
The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons.
209108
['The number of protons in the nucleus of the atom is equal to the atomic number (Z).', 'The number of electrons in a neutral atom is equal to the number of protons.', 'The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.']