دوری جدول

نویں جماعت · کیمیا · 6 سوالات

نام: ____________________ تاریخ: ____________

Elements in the same group of the periodic table have the same number of:
- A Valence electrons
- B Shells
- C Neutrons
- D Protons
Group IA elements are called:
- A Alkaline earth metals
- B Alkali metals
- C Halogens
- D Noble gases
Which of these is a noble gas?
- A Oxygen
- B Neon
- C Sodium
- D Chlorine
Moving from left to right across a period, the atomic size generally:
- A Stays the same
- B Increases
- C Doubles
- D Decreases
Halogens are found in group:
- A IIA
- B IA
- C VIIA
- D VIIIA
Mendeleev arranged elements in order of increasing:
- A Melting point
- B Atomic mass
- C Density
- D Atomic number

جوابی کلید

1. A, 2. B, 3. B, 4. D, 5. C, 6. B

Elements in one group have the same number of valence electrons and so similar properties.
Group IA (lithium, sodium, potassium and so on) are the alkali metals.
Neon is in group VIIIA with a full outer shell.
The nuclear charge rises while the number of shells stays the same, so atoms get smaller.
Fluorine, chlorine, bromine and iodine are in group VIIA.
Mendeleev used atomic mass. The modern table uses atomic number.