{"id":87841,"date":"2025-06-01T06:55:15","date_gmt":"2025-06-01T06:55:15","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87841"},"modified":"2025-06-01T06:55:15","modified_gmt":"2025-06-01T06:55:15","slug":"the-mass-number-of-argon-is-40-which-one-of-the-following-statements","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-mass-number-of-argon-is-40-which-one-of-the-following-statements\/","title":{"rendered":"The mass number of argon is 40. Which one of the following statements"},"content":{"rendered":"

The mass number of argon is 40. Which one of the following statements is correct?<\/p>\n

[amp_mcq option1=”The number of protons in argon is 22.” option2=”The number of neutrons in argon is 18.” option3=”The number of electrons in argon is 18.” option4=”The sum of numbers of protons and electrons in argon is 40.” correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-1 – 2022<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe number of electrons in a neutral atom of argon is 18.
\n<\/section>\n
\nThe mass number of an element is the sum of the number of protons and neutrons in the nucleus. The atomic number, which defines the element, is equal to the number of protons. In a neutral atom, the number of protons is equal to the number of electrons. Argon (Ar) has an atomic number of 18.
\n<\/section>\n
\nGiven mass number = 40. Atomic number of Argon = 18. Number of protons = 18. For a neutral atom, number of electrons = number of protons = 18. Number of neutrons = Mass number – Number of protons = 40 – 18 = 22.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

The mass number of argon is 40. Which one of the following statements is correct? [amp_mcq option1=”The number of protons in argon is 22.” option2=”The number of neutrons in argon is 18.” option3=”The number of electrons in argon is 18.” option4=”The sum of numbers of protons and electrons in argon is 40.” correct=”option3″] This question … <\/p>\n

Detailed SolutionThe mass number of argon is 40. Which one of the following statements<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1093],"tags":[1108,1162,1096],"class_list":["post-87841","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-1","tag-1108","tag-atomic-structure","tag-chemistry","no-featured-image-padding"],"yoast_head":"\nThe mass number of argon is 40. Which one of the following statements<\/title>\n<meta name=\"description\" content=\"The number of electrons in a neutral atom of argon is 18. The mass number of an element is the sum of the number of protons and neutrons in the nucleus. The atomic number, which defines the element, is equal to the number of protons. In a neutral atom, the number of protons is equal to the number of electrons. Argon (Ar) has an atomic number of 18.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/the-mass-number-of-argon-is-40-which-one-of-the-following-statements\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The mass number of argon is 40. Which one of the following statements\" \/>\n<meta property=\"og:description\" content=\"The number of electrons in a neutral atom of argon is 18. The mass number of an element is the sum of the number of protons and neutrons in the nucleus. The atomic number, which defines the element, is equal to the number of protons. In a neutral atom, the number of protons is equal to the number of electrons. Argon (Ar) has an atomic number of 18.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/the-mass-number-of-argon-is-40-which-one-of-the-following-statements\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T06:55:15+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"The mass number of argon is 40. Which one of the following statements","description":"The number of electrons in a neutral atom of argon is 18. 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