Question

References

Chapter 2: EOC

Choose the name and chemical symbol for a nonmetal in the second period.

 , carbon
 , lithium
 , beryllium

Choose the name and chemical symbol for an alkali metal in the fifth period.

, potassium
, barium
, cesium
, rubidium

Choose the name and chemical symbol for the third-period halogen.

, chlorine
, argon
, fluorine
, sulfur

Choose the name and chemical symbol for an element that is a gas at 20 °C and 1 atmosphere pressure.

, neon
, sulfur
, selenium
, arsenic

Submit Answer

Try Another Version

9 item attempts remaining

Atomic structure.

The synthetic radioactive element gallium is used in many medical studies. Give the number of electrons, protons, and neutrons in an atom of gallium-67.
 electrons
 protons
 neutrons

Radioactive americium-241 is used in household smoke detectors and in bone mineral analysis. Give the number of electrons, protons, and neutrons in an atom of americium-241.
 electrons

10 item attempts remaining

Answer 1

& out of carbon , lithium, beryllium in carbon is a non-metal belong to second period Its chemical symbel is ec² ② out of potanium barium cesium rubidium rubidium belongs to the Its chemical symbol is fifth period Rb² NOTE: The Horizontal lines/columns in modern periodic table are known as periods while the vertical columns are known as group. there are total 18 groups and a period. ② out of chlorine Argon Fluorine sulphun chlorine is a third-period Halogen and its chemical symbul is ea'. 6 At soc and exist, as gas is (We'. atmosphere pressure Neon and its chemical symbol

& Gallium-67 z atomic mars 674 atomic number humber of electrons number of protons - atomic number therefore, number of electrons 31 number of protors = 67 number of neutrons = (atomic mars) - Catomic number) - 67-3) - 36

Uum- 24] Americium - 241 chemical symbol - Am & symbolic representation with Atomic number 7 atomic mars and atomic mars 1 95 Atomic number number of electrons = number of pe oer of electrons = number of protons Atomic number therefore, so r t number of electrons = as armas number of protons - 95 number of neutron (mass number) - (atomic number, 2 941 - 95 196 bott nii Imars ne tomic 4