Group 17
Group 17 - Related Videos
12:38
Detection and Isolation of Viable Mouse IL-17-Secreting T Cells
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2008
This procedure describes the detection and isolation of mouse TH17 leukocytes that actively secrete IL-17 upon stimulation.
05:38
Micromechanical Tension Testing of Additively Manufactured 17-4 PH Stainless Steel Specimens
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Cited by 3 •
2021
Presented here is a procedure for measuring fundamental material properties through micromechanical tension testing. Described are the methods for micro-tensile specimen fabrication (allowing rapid micro-specimen fabrication from bulk material volumes by combining photolithography, chemical etching, and focused ion beam milling), indenter tip modification, and micromechanical tension testing (including an example).
08:31
The Calibration and Use of Capacitance Sensors to Monitor Stem Water Content in Trees
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Cited by 31 •
2017
The hydraulic capacitance of biomass is a key component of the vegetation water budget, which serves as a buffer against short and long-term drought stresses. Here, we present a protocol for the calibration and use of soil moisture capacitance sensors to monitor water content in the stems of large trees.
09:38
Physical Isolation of Endospores from Environmental Samples by Targeted Lysis of Vegetative Cells
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Cited by 17 •
2016
A method to single out bacterial endospores from complex microbial communities was developed to perform tailored culture or molecular studies of this group of bacteria.
06:00
Optimized and Simplified Technique for the Production and Culture of Precision-Cut Liver Slices
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2024
A protocol for the production and culture of Precision-cut Liver Slices (PCLS) for the study of mouse livers. The article focuses on key aspects of the protocol, which only requires standard laboratory equipment with access to a vibratome and allows survival of PCLS for a minimum of 4 days.
FAQs
The seven-electron valence shell makes electron gain a central bonding pathway. When a halogen atom gains one electron, it forms a negatively charged anion, while a metal supplies the electron and becomes positively charged. The resulting electrostatic attraction produces ionic halides, providing a basis for predicting formulas and bonding patterns in metal-halogen compounds.
Elemental halogens occur as pairs of atoms, forming diatomic molecules rather than isolated atoms. This molecular arrangement is a characteristic feature of their elemental form and must be considered when describing halogen reactions or comparing their physical states. It distinguishes the uncombined elements from the ionic halides formed after reaction with metals.
Reactivity generally decreases down Group 17 because atoms become larger and electron shielding increases. Additional occupied electron shells reduce the effective attraction experienced across the atom, making electron gain less favorable than it is for smaller members. This periodic trend helps chemists compare the expected behavior of fluorine, chlorine, bromine, iodine, and astatine.
The progression from gases to solids at room temperature reflects systematic changes in physical behavior within the group. Moving downward, the members differ increasingly in physical state while retaining related chemical patterns. Considering both properties together helps distinguish periodic trends in observable form from trends connected to electron configuration and bonding.
A useful prediction begins by identifying the halogen and the metal involved, then considering the halogen’s tendency to gain one electron. The expected product is an ionic halide containing a halogen anion and a metal cation. Group position further helps compare likely reactivity, with the general tendency decreasing as atomic size and shielding increase.
Halogen-containing compounds have roles in several applied areas, including disinfectants, pharmaceuticals, polymers, and other industrially important materials. These uses connect periodic-table principles to practical chemistry: electron configuration and bonding influence the compounds that can form, while their resulting chemical properties support different technological, medical, and manufacturing purposes.