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Aman was discussing the structure of atom with his classmates. During the discussion, he learnt that an element X has a mass number of 35 and contains 18 neutrons. Based on this information, answer the following questions: (i) How many electrons and protons does element X have? (ii) What is its atomic number? (iii) Identify the element X. (iv) Write its electronic configuration. (v) How many valence electrons does it have? (vi) What will be the mass number if two neutrons are added to its nucleus? (vii) What will be the relation of X with the new atom?
Subtracting 18 neutrons from mass number 35 gives 17 protons and 17 electrons. Its atomic number is 17, identifying it as chlorine Cl. The electronic configuration is 2, 8, 7, having seven valence electrons. Adding two neutrons increases its mass number from 35 to 37. Since both atoms have identicalRead more
Subtracting 18 neutrons from mass number 35 gives 17 protons and 17 electrons. Its atomic number is 17, identifying it as chlorine Cl. The electronic configuration is 2, 8, 7, having seven valence electrons. Adding two neutrons increases its mass number from 35 to 37. Since both atoms have identical atomic numbers but different mass numbers, the new atom is an isotope of chlorine.
For more NCERT Solutions of Class 9 Science Exploration Chapter 8 Journey Inside the Atom Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-8/
See lessIn an atom, there are 12 protons and 12 neutrons in the nucleus. Now, imagine that all the electrons are replaced with some hypothetical particles that have the same charge as electrons but are 500 times heavier. What effect will this replacement have on the atom’s: (i) Atomic number (ii) Atomic mass (iii) Mass number (iv) Overall charge
The atomic number remains 12 because it depends solely on protons in the nucleus. Atomic mass increases slightly because twelve particles 500 times heavier than electrons add noticeable extra mass. Mass number remains exactly 24 because it counts only protons and neutrons in the nucleus. Overall chaRead more
The atomic number remains 12 because it depends solely on protons in the nucleus. Atomic mass increases slightly because twelve particles 500 times heavier than electrons add noticeable extra mass. Mass number remains exactly 24 because it counts only protons and neutrons in the nucleus. Overall charge remains neutral at zero because the hypothetical particles retain identical negative charge to electrons.
For more NCERT Solutions of Class 9 Science Exploration Chapter 8 Journey Inside the Atom Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-8/
See lessNames of some animals are given below. Group them based on their habitats. Write the names of aquatic animals in the area marked ‘A’ and terrestrial animals in the area marked ‘B’. Enter the names of animals living in both habitats in part ‘C’. Horse, Dolphin, Frog, Sheep, Crocodile, Squirrel, Whale, Earthworm, Pigeon, Tortoise
Area 'A' represents aquatic animals that live exclusively in water, which are Dolphin and Whale. Area 'B' includes terrestrial animals living on land, comprising Horse, Sheep, Squirrel, Earthworm and Pigeon. Area 'C' represents the intersection for animals that inhabit both land and water environmenRead more
Area ‘A’ represents aquatic animals that live exclusively in water, which are Dolphin and Whale. Area ‘B’ includes terrestrial animals living on land, comprising Horse, Sheep, Squirrel, Earthworm and Pigeon. Area ‘C’ represents the intersection for animals that inhabit both land and water environments, including Frog, Crocodile and Tortoise, due to their specialized physiological adaptations to survive in both terrestrial and aquatic habitats.
For more NCERT Solutions of Class 6 Science Curiosity Chapter 2 Diversity in the Living World Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-6/science/curiosity-chapter-2/
See lessHere are two types of seeds. What differences do you find among the roots and leaf venation of their plants? (a) Wheat (b) Kidney beans
Wheat has seeds with a single cotyledon, making it a monocot plant. Consequently, it develops a fibrous root system and its leaves show parallel venation, where veins run side by side. In contrast, kidney bean seeds have two cotyledons, making them dicots. Therefore, kidney bean plants possess a maiRead more
Wheat has seeds with a single cotyledon, making it a monocot plant. Consequently, it develops a fibrous root system and its leaves show parallel venation, where veins run side by side. In contrast, kidney bean seeds have two cotyledons, making them dicots. Therefore, kidney bean plants possess a main taproot with smaller side roots and leaves displaying a net-like reticulate venation pattern.
For more NCERT Solutions of Class 6 Science Curiosity Chapter 2 Diversity in the Living World Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-6/science/curiosity-chapter-2/
See lessHow does the poet convey the superficial nature of words? What ought to be done to address this?
The poet exposes superficiality using agricultural and botanical metaphors: words are as worthless as garden weeds and resemble plants that produce a gaudy display of blossoms yet fail to grow a single particle of fruit. To resolve this hollowness, individuals must restrain idle talk, ensure every sRead more
The poet exposes superficiality using agricultural and botanical metaphors: words are as worthless as garden weeds and resemble plants that produce a gaudy display of blossoms yet fail to grow a single particle of fruit. To resolve this hollowness, individuals must restrain idle talk, ensure every spoken word is rooted in truth and reinforce sympathy with tangible, compassionate deeds.
For more NCERT Solutions of Class 9 English Kaveri Chapter 7 Words Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/english/kaveri-chapter-7/
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