What is the lightest element in group 1A?

Hydrogen, most abundant in the universe, is the chemical element with atomic number 1, and an atomic mass of 1.00794 amu, the lightest of all known elements.

What’s the lightest element in the Periodic Table 1 point?

Hydrogen is the lightest element and exhibits the simplest atomic structure.

Is lithium the lightest element?

Lithium is the lighest solid and metal and the third lightest element.

Which element is the heaviest in group 1?

Answer and Explanation:

  • Lithium-3.
  • Sodium-11.
  • Cesium-55.
  • Francium- 87.

Where are the lightest elements on the periodic table?

Note: Hydrogen is the lightest element in the periodic table but the periodic table is divided into groups. Among the group 1 elements, lithium is the lightest and among group 17 elements, fluorine is the lightest.

What are the lighter elements?

Hydrogen, helium, lithium and beryllium are the lightest four elements, with one, two, three and four protons, respectively. Hydrogen has no neutrons, helium has two, lithium has four and beryllium has five, and the masses of the elements increase in that order.

What are the two lightest elements?

What is the 2nd lightest element?

helium (He), chemical element, inert gas of Group 18 (noble gases) of the periodic table. The second lightest element (only hydrogen is lighter), helium is a colourless, odourless, and tasteless gas that becomes liquid at −268.9 °C (−452 °F).

Which are the lightest metals?

The first seven metals in the periodic table are lithium, beryllium, sodium, magnesium, aluminium, potassium and calcium, known collectively as the “lightest metals”.

What is the lightest alkali metal?

alkali lithium
Soft, silvery-white alkali lithium is the lightest metal and the lightest solid element.

What is the lightest halogen atom?

The lightest halogen, fluorine, is a pale yellow gas; iodine is a shiny, black solid.

Which is the least known element on the periodic table?

Though sandwiched between two very practical elements on the periodic table — thorium and uranium — protactinium is pretty much useless. The dearth of applications can primarily be attributed to the element’s rarity — it’s present at only a few parts per trillion in Earth’s crust.

What is the second lightest metal on the periodic table?

What is the second lightest metal? The element beryllium is perhaps one of the strangest in the periodic table. It is the second lightest metal (by atomic mass), after lithium, and it is also surprisingly unreactive compared to its elemental neighbours.

What is the least interesting element on the periodic table?

Thulium is among the most obscure elements in the periodic table. It has very few applications. Some people consider it the most useless of all naturally occurring elements, though others will rush to its defense. Scroll down to see examples of Thulium.

Which is the smallest element in periodic table?

hydrogen – a primary constituent of water,hydrocarbons and carbohydrates (not the same thing),one of the 5 main constituent elements of life (5MCE);

  • helium – many high-tech solutions,balloons for all sectors.
  • lithium – an extremely light metal.
  • beryllium – a very light metal with many high-tech uses.