The hydrogen atom has only one electron which is present in the first shell.
We know that first shell can hold a maximum of two electrons so due to incomplete valance shell hydrogen atom is reactive and make covalent bond with other reactive atoms. This bonding will complete its valance shell and finish its reactive nature. In the second shell and other shells can hold 8 electrons so we can conclude that hydrogen has one valance electron.
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(2) 59.3 s (4) 118 s
The half-life of sodium-25, when 1.00 gram of a 16.00-gram sample remains unchanged after 237 seconds, is approximately 59.3 seconds. This solution was found by calculating the number of times the sample halved and dividing the total time by this figure.
The question asks for the half-life of sodium-25 if 1.00 gram of a 16.00-gram sample remains unchanged after 237 seconds. In nuclear physics and nuclear chemistry, the half-life is the amount of time it takes for half of a sample of a radioactive substance to undergo decay.
Given that sodium-25 has gone from 16 grams to 1 gram, we can see that 1/16th of the original amount is left after 237 seconds. In other words, the quantity of sodium-25 has halved approximately 4 times. Therefore, the half-life will be the total time divided by the number of half-lives.
By dividing 237 seconds by 4, we get 59.25 seconds. So, the closest accurate answer is (2) 59.3s.
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35
65
95
Answer : The correct option is, 30 protons
Explanation :
Element = Zinc
Atomic number = 30
Atomic mass number = 65
As we know that the atomic number is equal to the number of electrons and number of protons.
Atomic number = Number of electrons = Number of protons = 30
Number of neutrons = Atomic mass - Number of protons = 65 - 30 = 35
Therefore, the number of protons an uncharged zinc atom have 30 protons.
Answer:
30 protons
Explanation:
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Electrically charged atoms or combinations of atoms are called ions. They are formed when atoms gain or lose electrons, becoming negatively charged (anions) or positively charged (cations).
Electrically charged atoms or combinations of atoms are called ions. Atoms are normally neutral, having equal numbers of protons and electrons. When an atom gains or loses electrons, it becomes charged, transforming into an ion. A negatively charged ion, or one that has gained electrons, is known as an anion. A positively charged ion, or one that has lost electrons, is referred to as a cation. This is a fundamental concept in chemistry.
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Atoms that are electrically charged are called ions. They can be either positively charged or negatively charged, depending on whether they gain or lose electrons. Specifically, an atom that gains electrons becomes a negatively charged anion, while an atom that loses electrons becomes a positively charged cation.
Atoms are electrically neutral if they contain the same number of positively charged protons and negatively charged electrons. When the numbers of these subatomic particles are not equal, the atom is electrically charged and is called an ion. The charge of an atom is defined as follows:
Atomic charge = number of protons - number of electrons
An atom that gains one or more electrons will exhibit a negative charge and is called an anion. Positively charged atoms called cations are formed when an atom loses one or more electrons.
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(B) 2–
(C) 3+
(D) 1+