3 июн. 2020 г. · Look up lithium in the periodic table. See its atomic number (Z). It is 3, and it means that there are 3 protons in its nucleus (this number of ... Which elements have two valence electrons in their atoms? An element has 2 neutrons, 2 electrons, and 2 protons ... - Quora What is the atomic number on this element? The ... - Quora An atom has 2 electrons in the K shell, 8 electrons in ... - Quora Другие результаты с сайта www.quora.com

21 янв. 2021 г. · All the numbers in the 2nd column (Group 2) have 2 electron in their outermost energy level. That would be elements such as Be (Beryllium), Mg (Magnesium), Ca ...

23 мая 2018 г. · Helium and lithium are elements that have two electrons in their outermost energy shell. Helium's both electrons fill its first shell, ...

9 янв. 2020 г. · The element is Calcium. It's atomic no. is 20. It's position in periodic table is group 2 and period 4 .It is a metal.

26 мая 2023 г. · An element A has 2 electrons in its fourth shell. State: (a) its atomic number. (b) its electronic configuration. (c) its valency.

2 мар. 2019 г. · Answer:An element A has two electrons in its fourth shell, so it will appear as 4s²4p⁰. Therefore, the given element A is Calcium.

The number of electron in a neutral atom is equal to the number of protons, therefore, the atomic number of this element is 12.

9 янв. 2020 г. · An element has 2 electrons in its N shell (i) What is its atomic number ? (ii) State its position in periodic table

15 мар. 2023 г. · Answer. (i) Atomic Number is 20. (ii) It belongs to group 2 and fourth period. (iii) It is a metal. (iv) The name assigned to this group is IIA.