B. Name the following.
1. Two metals which reacts vigorously with water.
2. The gas used during the process of photosynthesis.
3. A neutral oxide which exists in liquid state at room temperature.
4. The electrostatic force between two atoms.
5. The electrons participate in the chemical reaction are ______.
6. Salt commonly called soda ash.
Answers
Answer:
Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table. Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all baryonic mass.[7][note 1] Non-remnant stars are mainly composed of hydrogen in the plasma state. The most common isotope of hydrogen, termed protium (name rarely used, symbol 1H), has one proton and no neutrons.
Hydrogen, 1H
Hydrogen discharge tube.jpg
Purple glow in its plasma state
Hydrogen
Appearance
colorless gas
Standard atomic weight Ar, std(H)
[1.00784, 1.00811] conventional: 1.008
Hydrogen in the periodic table
Hydrogen
Helium
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
Sodium
Magnesium
Aluminium
Silicon
Phosphorus
Sulfur
Chlorine
Argon
Potassium
Calcium
Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
Nickel
Copper
Zinc
Gallium
Germanium
Arsenic
Selenium
Bromine
Krypton
Rubidium
Strontium
Yttrium
Zirconium
Niobium
Molybdenum
Technetium
Ruthenium
Rhodium
Palladium
Silver
Cadmium
Indium
Tin
Antimony
Tellurium
Iodine
Xenon
Caesium
Barium
Lanthanum
Cerium
Praseodymium
Neodymium
Promethium
Samarium
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
Iridium
Platinum
Gold
Mercury (element)
Thallium
Lead
Bismuth
Polonium
Astatine
Radon
Francium
Radium
Actinium
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium
Rutherfordium
Dubnium
Seaborgium
Bohrium
Hassium
Meitnerium
Darmstadtium
Roentgenium
Copernicium
Nihonium
Flerovium
Moscovium
Livermorium
Tennessine
Oganesson
–
↑
H
↓
Li
– ← hydrogen → helium
Atomic number (Z)
1
Group
1: H and alkali metals
Period
period 1
Block
s-block
Element category
Other nonmetal
Electron configuration
1s1
Electrons per shell
1
Physical properties
Phase at STP
gas
Melting point
(H2) 13.99 K (−259.16 °C, −434.49 °F)
Boiling point
(H2) 20.271 K (−252.879 °C, −423.182 °F)
Density (at STP)
0.08988 g/L
when liquid (at m.p.)
0.07 g/cm3 (solid: 0.0763 g/cm3)[1]
when liquid (at b.p.)
0.07099 g/cm3
Triple point
13.8033 K, 7.041 kPa
Critical point
32.938 K, 1.2858 MPa
Heat of fusion
(H2) 0.117 kJ/mol
Heat of vaporization
(H2) 0.904 kJ/mol
Molar heat capacity
(H2) 28.836 J/(mol·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 15 20
Atomic properties
Oxidation states
−1, +1 (an amphoteric oxide)
Electronegativity
Pauling scale: 2.20
Ionization energies
1st: 1312.0 kJ/mol
Covalent radius
31±5 pm
Van der Waals radius
120 pm
Color lines in a spectral range
Spectral lines of hydrogen
Other properties
Natural occurrence
primordial
Crystal structure
hexagonalHexagonal crystal structure for hydrogen
Speed of sound
1310 m/s (gas, 27 °C)
Thermal conductivity
0.1805 W/(m·K)
Magnetic ordering
diamagnetic[2]
Magnetic susceptibility
−3.98·10−6 cm3/mol (298 K)[3]
CAS Number
12385-13-6
1333-74-0 (H2)
History
Discovery
Henry Cavendish[4][5] (1766)
Named by
Antoine Lavoisier[6] (1783)
Main isotopes of hydrogen
Isotope Abundance Half-life (t1/2) Decay mode Product
1H 99.98% stable
2H 0.02% stable
3H trace 12.32 y β− 3He
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Answer:
1.sodium and potassium
2.carbon dioxide
3.bromine
4.gravitational force
5.atoms
6.no